Answer:

purrs

AnswerCrossword Clue
PURRSSounds like a pussy
PURRSHums
PURRSSounds satisfied
PURRSDoesn't ping
PURRSSounds of contentment
PURRSRuns smoothly, like an engine
PURRSSigns of kitty's contentment
PURRSWas recently tuned, as an engine
PURRSCat murmurs
PURRSSiamese sounds
PURRSDoesn't knock?
PURRSSounds content
PURRSContented cat sounds
PURRSRuns smoothly
PURRSRuns great
PURRSExpresses pleasure
PURRSPost tune-up sounds
PURRSActs contentedly
PURRSGood vibrations, in the cat world
PURRSKitty's murmurs
PURRSContented sounds
PURRSSounds contented
PURRSBetrays contentment
PURRSRuns well
PURRSWell-tuned engine sounds
PURRSContented cats' sounds
PURRSShows contentment
PURRSSounds from content Persians
PURRSCatty sounds.
PURRSContented feline sounds.
PURRSMurmurs contentedly.
PURRSPleasant sounds.
PURRSLow, vibratory sounds.
PURRSFeline sounds.
PURRSSounds of contentment.
PURRSContented sounds.
PURRSMotor sounds.
PURRSSounds contented.
PURRSAilurophiles' rewards
PURRSGood engine sounds