the iron or strap on the shaft of a horse-drawn vehicle to which the breeching of the harness is attached, enabling the horse to hold back or to back the vehicle.
2.
a device for restraining or checking, as a doorstop or tieback.
3.
a stop or delay: a holdback in negotiations.
4.
a withholding: the holdback of a day's pay.
5.
something, as a planned expenditure or allotment, that is withheld or deferred.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.