- - Works efficiently
- - hive emanations
- - Sings without singing
- - Sings with the mouth closed
- - sings without lyrics
- - Purrs like an engine
- - Vibrational sounds
- - Sings without opening one's mouth
- - Carries a tune, in a way
- - Murmurs tune
- - Sings, in a way
- - Purrs like a well-tuned engine
- - Plays the kazoo
- - Emulates a bumble bee
- - Doesn't remember the words, say
- - Buzzing sounds
- - Runs perfectly
- - Motor noises
- - Sings wordlessly
- - Sounds of well-tuned engines
- - Plays a kazoo
- - Sounds of activity
- - Runs nicely
- - Is abuzz
- - Ambient noises from appliances, e.g
- - What idle amp does
- - Operates perfectly
- - Forgets the words, maybe
- - Keeps one's mouth shut?
- - Sings without words
- - Joins in wordlessly
- - Is busy
- - Plays a kazoo, basically
- - Doesn't quite sing
- - Obviously doesn't know the words
- - Sings with a closed mouth
- - Sings close-mouthed
- - Operates smoothly
- - Ambient sounds
- - Symptoms for a car mechanic
- - Is at a loss for words?
- - Sings with closed mouth
- - Close-mouthed singing
- - Sings along without words
- - Buzzes along
- - Runs well, as an engine
- - Performs musically sans words
- - Purrs
- - Droning sounds
- - Accompanies musically sans words
- - Operates well
- - Indistinct sounds of mingled voices
- - Sings to oneself
- - Bombinates
- - Insect noises
- - Bee sounds
- - Sounds of a kind
- - Is full of activity.
- - Insect sounds.
- - Sings in a certain way.
- - Is full of activity: Colloq.
- - Factory noises.
- - Sings a tune.
- - Really cooks
- - Chugs on all cylinders
- - Song sounds
- - Runs smoothly
- - Runs smoothly, as an engine
- - Runs well
- - Drones
- - Bustles
- - Buzzes
- - Engine sounds.
- - Goes "mmm mmm mmm mmm," maybe
- - sounds, as bees
- - Sounds from smoothly running machines
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