Idiom Definition:
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"to rock the boat"
to make a challenge to a stable and comfortable situation
usually by criticizing or trying to change the situation
Synonyms:
boycott, break, censure, combat, defect, defy, disobey, dissent, fight, insurrect, insurrection, mutiny, oppose, remonstrate, resist, revolt, riot, rise, secede, status quo, upset
Literally,
rocking the boat ...
Technically this is a canoe which is a type of boat.