n. 25B6; verb
the engine was humming : PURR, drone, murmur, buzz, thrum, whirr, throb, vibrate; poetic/literary bombinate.
she hummed a tune : sing, croon, murmur, drone.
the workshops are humming : BE BUSY, be active, be lively, buzz, bustle, be a hive of activity, throb.
(Brit. informal) this stuff really hums. : See reek verb .
25B6; noun a low hum of conversation : MURMUR, drone, purr, buzz; poetic/literary bombination.
25A0; hum and haw (Brit.) HESITATE, dither, vacillate, be indecisive, equivocate, prevaricate, waver, blow hot and cold; Brit. haver; Scottish swither; informal shilly-shally.