What is the answer to "Sound of a smooth-running engine" in the NYT Crossword?

The answer to the NYT Crossword clue "Sound of a smooth-running engine" is PURR (4 letters).

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NYT

Sound of a smooth-running engine NYT Crossword Clue

Down clue · from the February 23, 2025 puzzle

Stuck on “Sound of a smooth-running engine” from the New York Times Crossword? Here is the verified answer:

Answer

PURR

4 letters · Down · last seen February 23, 2025