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Do means to accomplish an action. (verb)

An example of do is to complete a homework assignment.

See do in Webster's New World College Dictionary

transitive verb did, done, doing

1. to execute; effect; perform (an act, action, etc.): do great deeds
2. to carry out; fulfill: do what I tell you
to bring to completion; finish: dinner has been done for an hour
to bring about; cause; produce: it does no harm; who did this to you?
to exert (efforts, etc.): do your best
to have or take (a meal): let's do lunch
to deal with as is required; attend to: do the ironing, do one's nails or hair
to have as one's work or occupation; work at or on: what does he do for a living?
to work out; solve: do a problem
to produce or appear in (a play, etc.): we did Hamlet
1. to play the role of: I did Polonius
2. Informal to imitate, or behave characteristically as: to do a Houdini
to write or publish (a book), compose (a musical score), etc.
1. to cover (distance): to do a mile in four minutes
2. to move along at a speed of: to do 60 miles an hour
to visit as a sightseer; tour: they did England in two months
to translate: to do Horace into English
to give; render: to do honor to the dead
to suit; be convenient to: this will do me very well
Informal
1. to prepare; cook: that restaurant does ribs really well
2. to eat: let's do Mexican tonight
Informal to cheat; swindle: you've been done
Informal to serve (a jail term)
Slang to take; ingest; use: we've never done drugs
Slang to perform a sexual act upon; specif., to have sexual intercourse with
Slang to kill

intransitive verb

to act in a specified way; behave: he does well when treated well
to be active; work: do; don't merely talk
to finish: used in the perfect tense [have done with dreaming]
to get along; fare: mother and child are doing well
to be adequate or suitable; serve the purpose: the black dress will do
to take place; go on: anything doing tonight?
Chiefly Brit., Informal used as a substitute verb after a modal auxiliary or a form of have in a perfect tense: I haven't seen the film, but she may have done

auxiliary verb

used to give emphasis, or as a legal convention: do stay a while, do hereby enjoin
used to ask a question: did you write?
used to serve as part of a negative command or statement: do not go, they do not like it
used to serve as a substitute verb: love me as I do (love) you
used to form inverted constructions after some adverbs: little did he realize

noun pl. do's or dos

Chiefly Brit., Informal a hoax; swindle
Chiefly Brit., Informal a party or social event
Slang excrement; feces: dog do

noun

Music a syllable representing the first or last tone of the diatonic scale

noun

Slang hairdo

or do

ditto

or D.O.

Doctor of Osteopathy

See do in American Heritage Dictionary 4

(do͞o)

verb did did (dĭd), done done (dŭn), do·ing, does does (dŭz)

verb, transitive

a. To perform or execute: do one's assigned task; do a series of business deals.
b. To fulfill the requirements of: did my duty at all times.
c. To carry out; commit: a crime that had been done on purpose.
a. To produce, especially by creative effort: do a play on Broadway.
b. To play the part or role of in a creative production: did Elizabeth I in the film.
c. To mimic: “doing the Southern voice, improvising it inventively as he goes along” (William H. Pritchard).
a. To bring about; effect: Crying won't do any good now.
b. To render; give: do equal justice to the opposing sides; do honor to one's family.
To put forth; exert: Do the best you can.
a. To attend to in such a way as to take care of or put in order: did the bedrooms before the guests arrived.
b. To prepare for further use especially by washing: did the dishes.
a. To set or style (the hair).
b. To apply cosmetics to: did her face.
To have as an occupation or profession: Have you decided what you will do after college?
To work out by studying: do a homework assignment.
Used as a substitute for an antecedent verb: He can play the piano, and I can do that, too.
Informal
a. To travel (a specified distance): do a mile in four minutes.
b. To make a tour of; visit: “[He] did 15 countries of Western Europe in only a few days” (R.W. Apple, Jr.)
a. To be sufficient in meeting the needs of; serve: This room will do us very nicely.
b. Informal To serve (a prison term): did time in jail; did five years for tax fraud.
Slang To cheat; swindle: do a relative out of an inheritance.
Slang To take (drugs) illegally: “If you do drugs you are going to be in continual trouble” (Jimmy Breslin).
Slang To kill; murder.
Vulgar Slang To have sex with; bring to orgasm.

verb, intransitive

To behave or conduct oneself; act: Do as I say and you won't get into trouble.
a. To get along; fare: students who do well at school.
b. To carry on; manage: I could do without your interference.
c. To make good use of something because of need: I could do with a hot bath.
a. To serve a specified purpose: This coat will do for another season.
b. To be proper or fitting: Such behavior just won't do.
To take place; happen: What's doing in London this time of year?
Used as a substitute for an antecedent verb: worked as hard as everyone else did.
Used after another verb for emphasis: Run quickly, do!

verbaux.

Used with the infinitive without to in questions, negative statements, and inverted phrases: Do you understand? I did not sleep well. Little did we know what was in store for us.
Used as a means of emphasis: I do want to be sure.

noun pl. DOS dos or do's

A statement of what should be done: a list of the dos and don'ts of management.
Informal An entertainment; a party: attended a big do at the embassy.
A commotion.
Chiefly British Slang A swindle; a cheat.
Archaic Duty; deed.
Slang Fecal matter; excrement.

Phrasal Verbs: do by To behave with respect to; deal with: The children have done well by their aged parents. do for To care or provide for; take care of. do in Slang To tire completely; exhaust: The marathon did me in. To kill. To ruin utterly: Huge losses on the stock market did many investors in. do up To adorn or dress lavishly: The children were all done up in matching outfits. To wrap and tie (a package). To fasten: do up the buttons on a dress. do without To manage despite the absence of: We had to do without a telephone on the island.

(dō)

noun
Music

The first tone of the diatonic scale in solfeggio.

(do͞o)

noun pl. DOS dos
Slang

A hairdo.

abbreviation