Word: HUM

The word HUM has appeared in at least 117 clues on different crosswords.

Clue(s)
Fan noise
Run smoothly
Droning sound
Use kazoos
Purr, as an engine
Low sound
Sing without words
Ho-___ (kind of boring)
Bee's buzz
Bustle
Be busy
How to play a kazoo
Well-tuned engine output
Purr, as an engine
Rhythmic sound
Sing with mouth closed
Vibration sound
Drone
Drone
"Rattle and ___" (U2 album with the hit song "Desire")
Smooth engine sound
Drone
Operate smoothly
Background noise
Low murmur
Engine sound
Sing with one's mouth closed
Bee's buzz
Sing with your mouth closed
Sing without words
Droning tone
Sing with a closed mouth
Smooth engine sound
Engine's purr
Droning sound
Persistent drone
Run smoothly
Engine sound
Bees make it
Air-conditioning sound
Sound made by a smoothly running engine
Sing with closed lips
Run smoothly
Sing without words
Buzzing drone
Sound from a fan
Croon
Droning sound
Sing with closed lips
Generator's output
Drone
Hive sound
Bustle
Sing without words
Croon
Forget the words maybe
Make a low, steady sound
Run smoothly
Buzzing sound
Fire on all cylinders
Background noise
Droning sound
"Rattle and ___" (1988 U2 album/film)
Purr, as an engine
Bee's buzz
Bustle
Sing a wordless tune
Purr, as an engine
Go smoothly
Sing with a closed mouth
Refrigerator sound
Drone
Carry a tune without words
Air-conditioning sound
Sing a melody without words
Bee's buzz
Sing without words
Droning tone
Run smoothly
Sing along without words
Sing with a closed mouth
Engine's purr
Droning sound
"Rattle and ___" (1988 U2 album/film)
Persistent drone
Run smoothly
___bug!
Sing with your mouth closed
Keep one's mouth shut?
Play a kazoo
Sound of a smooth engine
Sing with closed lips
Make music, sort of
Droning sound from an electric razor
Buzzing drone
Croon
Droning sound
Make music on a kazoo, say
Sing with one's mouth closed
Be busy, as a bee
Ho-___ (rather dull)
Run smoothly
Drone
Run smoothly
Hive sound
Bustle
How to play a kazoo
Sing without words
Croon
Make a low, steady sound
Purr, as an engine
Carry a tune without words
Buzzing sound
Sing wordlessly
Droning sound
Run smoothly
Bee's buzz