Crossword Genius

High-dive move; buckle amidships (9)

Ross

I believe the answer is:

jackknife

(Other definitions for jackknife that I've seen before include "Double up out of control (of articulated lorries)" , "Go out of control" , "Dive bent double" , "(Articulated) vehicular doubling up" , "Cutter needed" .)

I've seen this clue in the Sydney Morning Herald.
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