retract

Short definition from Wiktionary

Verb

1. 1
   To pull (something) back or back inside.
2. 2
   To pull (something) back or back inside: To draw (an extended body part) back into the body.
3. 3
   To avert (one's eyes or a gaze).
4. 4
   To pronounce (a sound, especially a vowel) farther to the back of the vocal tract.
5. 5
   To hold back (something); to restrain.
6. 6
   To draw back; to draw up; to withdraw.
7. 7
   To cancel or take back (something, such as an edict or a favour or grant previously bestowed); to rescind, to revoke.
8. 8
   To break or fail to keep (a promise, etc.); to renege.
9. 9
   To take back or withdraw (something that has been said or written); to disavow, to repudiate.
10. 10
    Originally in chess and now in other games as well: to take back or undo (a move); specifically (card games) to take back or withdraw (a card which has been played).
11. 11
    To decline or fail to do something promised; to break one's word.
12. 12
    Of something said or written (such as published academic work): to take back or withdraw.
13. 13
    To change one's mind after declaring an intention to make a certain move.

Noun

1. 1
   An act of retracting or withdrawing (a mistake, a statement, etc.); a retraction.
2. 2
   A pulling back, especially (military) of an army or military troops; a pull-back, a retreat; also, a signal for this to be done.
3. 3
   A subgroup of a given group such that there is a surjective endomorphism from the ambient group to the subgroup which is constant on the subgroup; in this case the subgroup is a retract of the ambient group. In symbols: H in G is a retract of G if there exists a surjective homomorphism σ from G to H with σ|_H= operatorname id.
4. 4
   The target of a retraction.
5. 5
   Synonym of retreat (“an act of accidentally injuring a horse's foot by incorrectly nailing it during shoeing”).