Answer: purr

AnswerCrossword Clue
PURRContented kitty's sound
PURRRelaxed sound
PURRRun really well
PURRRun softly
PURRSound smooth
PURRContented kitten's sound
PURRManx murmur
PURRMusic to a cat lover's ears
PURRRun well
PURRSiamese sign of contentment
PURRSound finely tuned
PURRBe catty
PURRShow contentedness, perhaps
PURRSiamese sound of contentment
PURRSound from a Siamese
PURRSound from an Abyssinian
PURRSound of a fine-tuned engine
PURRFeline hum
PURRHappy cat's sound
PURRSound of pleasure
purrthe low, continuous vibrating sound made by a cat
PURRSiamese sound
PURRGood engine sound
PURRContented kitty sound
PURRSound content
PURREngine sound
PURRHappy engine sound
PURRAbyssinian "aah"
PURRHappy hum
PURRSound of happiness
PURRSound of a well-tuned engine
PURRKitty's satisfied sound
PURRSmooth idle
PURRSmooth-running sound
PURRSound of contentment
PURRContented murmur
PURRCopy cats?
PURRCat nap sound
PURRContented cat's sound
PURRRun smoothly