hum

hum
/h_m/

Verb
Make a low, steady continuous sound like that of a bee.

Noun
A low, steady, continuous sound.Exclamation
Used to express hesitation or dissent: “ÒAh, hum, Elaine, isn’t it?Ó”.

Synonyms
verb. buzz – drone – croon – whirr – murmur noun. buzz – drone – whirr – whir – murmur