Pop1  —n. 1 sudden sharp explosive sound as of a cork when drawn. 2 colloq. Effervescent drink. —v. (-pp-) 1 (cause to) make a pop. 2 (foll. By in, out, up, etc.) Go, move, come, or put unexpectedly or abruptly (pop out to the shop). 3 slang pawn. —adv. With the sound of a pop (go pop).  pop off colloq. Die. Pop the question colloq. Propose marriage. [imitative]