This movement was called pedal bob, kickback, or monkey motion and took power out of a rider's pedal stroke - especially during climbs up steep hills.

(often called kickback or simply recoil)

(often called kickback or simply kick)

A jammed blade will cause the saw to recoil suddenly, a dangerous condition called kickback.

The biggest danger when using a portable circular saw is called kickback.

That will cause the saw to recoil, a potentially dangerous mishap called kickback.