What does the cryptic crossword clue "Card cutter to double up (9)" mean?

The definition is "to double up". The wordplay uses a charade (building blocks). JACK (synonym of "Card") + KNIFE (synonym of "cutter"); definition: "to double up" The answer is JACKKNIFE.

Card cutter to double up (9)

Times Cryptic #29201 | 1 Across | 2025-04-11 flower

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