Clue: Runs well, as an engine

We have 1 answer for the crossword clue Runs well, as an engine.

Possible Answers:

• HUMS

Related Clues:

• Chef's measure (Abbr.)
• Closed mouthed songs
• Drones
• Forgets the words, maybe
• Hi-fi annoyances
• Indistinct sounds of mingled voices
• Is at a loss for words?
• Is busy
• Performs musically sans words
• Purrs
• Runs smoothly
• Sounds of activity

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