cǎi

to step on / to tread / to stamp / to press a pedal / to pedal (a bike)

cǎità

to trample on

cǎishuǐ

to tread water / to paddle or tramp in shallow water

cǎixiàn

step on the line / foot-fault

cǎidào

to scout / to reconnoiter

págāocǎidī

crawl high, step low (idiom); unprincipled crawling, flattering one's superiors and trampling on one's juniors / toadying and bullying

cǎigāoqiāo

to walk on stilts

cǎishāchē

to step on the brake / to brake (when driving)

cǎidòng

to operate by means of a pedal

wǎngnìlǐcǎi

to belittle / to attack sb