RUNS SMOOTHLY, AS AN ENGINE Crossword Clue

The most common solutions for the crossword clue "RUNS SMOOTHLY, AS AN ENGINE" are HUMS with 4 letters, PURRS with 5 letters.
We know 2 solutions for: RUNS SMOOTHLY, AS AN ENGINE
Crossword Puzzle Infos
The term 'Runs Smoothly, as an Engine' can be summarized by two crossword solutions: HUMS (4 letters) and PURRS (5 letters). HUMS is a low, steady sound made by an engine that is running smoothly. PURRS is a similar sound, but it is softer and more pleasant than a hum. Both of these sounds indicate that an engine is running efficiently and without any issues.
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