(cǎi) to step on; to tread; to stamp; to press a pedal; to pedal (a bike)
(cǎishāchē) to step on the brake; to brake (when driving)
(cǎidòng) to operate by means of a pedal
(cǎishuǐ) to tread water; to paddle or tramp in shallow water
(cǎixiàn) step on the line; foot-fault
(cǎità) to trample on
(cǎidào) to scout; to reconnoitre
(cǎigāoqiāo) to walk on stilts