on someone's part

noun

1. a portion or division of a whole; specif.,
   1. any of several equal portions, quantities, numbers, pieces, etc. of which something is composed or into which it can be divided: a cent is a 100th part of a dollar
   2. an essential element or constituent; integral portion which can be separated, replaced, etc.: automobile parts
   3. a portion detached or cut from a whole; fragment; piece
   4. a certain amount but not all: to lose part of one's fortune
   5. a certain amount or section regarded as a separate division
   6. a segment or organ of the body of men and animals
   7. a division of a literary work
   8. Math. an aliquot part
2. a portion assigned or given; share; specif.,
   1. something a person must do; share of work or duty: to do one's part
   2. interest or concern: to have some part in a matter
   3. talent; ability: a man of parts
   4. a character or role in a theatrical presentation; also, the words, actions, etc. of a character in a play
   5. Music the score for a particular voice or instrument in a concerted piece; also, any of the voices or instruments in a musical ensemble
3. 1. a region; area
   2. a portion of a country; district
4. one of the different sides or parties in a transaction, dispute, conflict, etc.
5. ☆ the dividing line formed by combing the hair in different directions

transitive verb

1. to break or divide into separate parts
2. to comb (the hair) in different directions so as to leave a dividing line
3. to break up (a connection or relationship) by separating those involved
4. to separate (two or more persons or things); break or hold apart
5. to separate (substances) as by a chemical process
6. Archaic to distribute; share; apportion
7. Naut. to break or undergo the breaking of (a hawser, chain, etc.)

intransitive verb

1. to break or divide into two or more pieces
2. to separate and go different ways, as branches of a river
3. to separate; leave each other; cease associating
4. 1. to go away; leave; depart: with from
   2. to die

adjective

adverb