Bounce  —v. (-cing) 1 (cause to) rebound. 2 slang (of a cheque) be returned by a bank when there are no funds to meet it. 3 (foll. By about, up, in, out, etc.) Jump, move, or rush boisterously. —n. 1 a rebound. B power of rebounding. 2 colloq. A swagger, self-confidence. B liveliness.  bounce back recover well after a setback.  bouncy adj. (-ier, -iest). [imitative]