bang
noun
1 the door slammed with a bang:
sharp noise, crack, boom, clang, peal, clap, pop, snap, knock, tap, slam, bump, thud, thump, clunk, clonk, clash, crash, smash, smack;
stamp, stomp, clump, clomp;
report, explosion, detonation, shot;
informal wham, whump.
2 a nasty bang on the head:
blow, hit, punch, knock, thump, rap, bump, thwack, smack, crack, slap, welt, cuff, box;
informal bash, whack, clobber, clout, clip, wallop, belt, tan, biff, bop, sock, lam, whomp;
British, informal slosh;
North American, informal boff, bust, slug, whale;
Australian, New Zealand, informal dong;
dated buffet.
verb
1 he began to bang the table with his fist:
hit, strike, beat, thump, hammer, knock, rap, pound, thud, punch, bump, thwack, smack, crack, slap, slam, welt, cuff, pummel, buffet;
informal bash, whack, clobber, clout, clip, wallop, belt, tan, biff, bop, sock, lam, whomp;
British, informal slosh;
North American, informal boff, bust, slug, whale;
Australian, New Zealand, informal dong.
adverb informal
1 bang in the middle of town | the train arrived bang on time:
precisely, exactly, right, directly, immediately, squarely, just, dead;
promptly, prompt, dead on, on the stroke of …, on the dot of …;
sharp, on the dot;
informal spot on, smack, slap, slap bang, plumb;
North American, informal on the button, on the nose, smack dab, spang.
2 the machines will be bang up to date:
completely, absolutely, totally, entirely, wholly, fully, thoroughly, utterly, quite, altogether, one hundred per cent, downright, unqualifiedly, in all respects, unconditionally, perfectly, unrestrictedly, undisputedly, to the maximum extent;
informal clean, plumb, dead.
3 the minute something becomes obsolete, bang, it's gone:
suddenly, abruptly, immediately, instantaneously, instantly, in an instant, straight away, all of a sudden, at once, all at once, promptly, in a trice, swiftly;
unexpectedly, without warning, without notice, on the spur of the moment;
informal straight off, out of the blue, in a flash, like a shot, before you can say Jack Robinson, before you can say knife, in two shakes (of a lamb's tail).
bang (1) Oxford Dictionary of English