Take an unplanned trip (6)

I believe the answer is:

tumble

(Other definitions for tumble that I've seen before include "An acrobatic feat of rolling or turning end over end" , "Suddenly fall" , "Roll over and over like acrobat or pigeon" , "(and 10) It may be used after 12 18" , "Fall, roll, twist" .)

I've seen this clue in The New York Times.

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