undo

Undo is defined as to release, reverse or put an end to.

(verb)

An example of undo is unzipping a dress in order to take it off.
An example of undo is a drug addict using drugs after being sober for many years.
An example of undo is bringing disgrace to a formerly well-thought of family.

See undo in Webster's New World College Dictionary

transitive verb undid, undone, undoing

1. to release or untie (a fastening)
2. to open (a parcel, door, etc.) by this means
to reverse the doing of (something accomplished); do away with; cancel; annul
to put an end to; bring to ruin, disgrace, or downfall
to upset emotionally; perturb
Obsolete to interpret; explain

Origin: ME undon < OE < un-, un- + don, to do

Related Forms:

See undo in American Heritage Dictionary 4

verb un·did (-dĭdˈ), un·done (-dŭnˈ), un·do·ing (-do͞oˈĭng), un·does (-dŭzˈ)

verb, transitive

To reverse or erase; annul: impossible to undo the suffering caused by the war.
To untie, disassemble, or loosen: undo a shoelace.
To open (a parcel, for example); unwrap.
a. To cause the ruin or downfall of; destroy.
b. To throw into confusion; unsettle.
Obsolete To solve or interpret; unravel.

verb, intransitive

To come open or unfastened.

Related Forms: