蹭

磨蹭

mó ceng

to rub lightly

刮蹭

guā cèng

to scrape one's car against sth

磨磨蹭蹭

mó mó cèng cèng

to dillydally

蹭吃

cèng chī

to freeload for food

蹭吃蹭喝

cèng chī cèng hē

to cadge a meal

蹭热度

cèng rè dù

(coll.) (often derog.) to piggyback on (sb's) popularity

蹭网

cèng wǎng

(coll.) to use sb else's Internet connection (with or without permission)

蹭课

cèng kè

(coll.) to sit in on a class

蹭蹬

cèng dèng

(literary) to encounter setbacks; to have bad luck

蹭车

cèng chē

(coll.) to ride in sb else's car to save money

蹭饭

cèng fàn

(coll.) to mooch a meal