“Fly by night ... or by day” crossword clue

Reveal the answer to see why it works and where this clue has appeared before.PEST is the answer to the New York Times crossword clue “Fly by night ... or by day”. It was last seen in the puzzle of December 17, 2025, where it runs at 13 Down and fills 4 squares. It crosses 4 other entries in that grid — those are listed below and are the quickest way to confirm the letters you already have.