A rotating or rolling motion in the opposite direction to another rolling motion, or a nautical term for a ship rolling back in the opposite direction.
From counter- + roll. Roll comes from Old French rolle meaning a cylinder or wheel. Counter- indicates opposite direction. This technical term appears in mechanical and nautical contexts.
Ships and submarines use counterroll to stabilize themselves—when waves push a ship one way, its stabilizers roll the opposite direction, canceling out the motion. It's physics defeating nature.
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