Unexpectedly Reverse One's Previous Opinion

This page is the CodyCross answer for the clue below from Botanical Garden, Group 1437, Puzzle 2 (Amaranthus).

Question is: Unexpectedly Reverse One's Previous Opinion

and the answer is: BACKPEDAL

Word Meaning:

BACKPEDAL — (intransitive) To pedal backwards on a bicycle.

Definitions from Wiktionary.