What is the answer to "Stack (up)" in the NYT Crossword?

The answer to the NYT Crossword clue "Stack (up)" is PILE (4 letters).

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NYT

Stack (up) NYT Crossword Clue

Down clue · from the December 26, 2025 puzzle

Stuck on “Stack (up)” from the New York Times Crossword? Here is the verified answer:

Answer

PILE

4 letters · Down · last seen December 26, 2025