To decline or fail to do something promised; to break one's word.
To avert (one's eyes or a gaze).
To pull (something) back or back inside.
Of something said or written (such as published academic work): to take back or withdraw.
To draw (an extended body part) back into the body.
To take back or withdraw (something that has been said or written); to disavow, to repudiate.
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).
To break or fail to keep (a promise, etc.); to renege.
To draw back; to draw up; to withdraw.
To pronounce (a sound, especially a vowel) farther to the back of the vocal tract.
To cancel or take back (something, such as an edict or a favour or grant previously bestowed); to rescind, to revoke.
To make invalid or worthless.
To throw or send out; to evacuate; to emit; to discharge.
To empty.
An empty place; A location that has nothing useful.
An empty space; a vacuum.
A collection of adjacent vacancies inside a crystal lattice.
A pocket of vapour inside a fluid flow, created by cavitation.
An extended region of space containing no galaxies.
An empty space between floors or walls, including false separations and planned gaps between a building and its facade.
A black cat.
That does not return a value; a procedure.
Containing nothing; empty; not occupied or filled.
Having no incumbent; unoccupied; said of offices etc.
Being without; destitute; devoid.
Containing no immaterial quality; destitute of mind or soul.
Not producing any effect; ineffectual; vain.
Of no legal force or effect, incapable of confirmation or ratification.