畫地為牢

lit. to be confined within a circle drawn on the ground (idiom) / fig. to confine oneself to a restricted range of activities

-ly / structural particle: used before a verb or adjective, linking it to preceding modifying adverbial adjunct

earth / ground / field / place / land / CL:片[pian4]

firm / sturdy / fold (for animals) / sacrifice / prison

as (in the capacity of) / to take sth as / to act as / to serve as / to behave as / to become / to be / to do / by (in the passive voice)

because of / for / to

to draw / picture / painting / CL:幅[fu2],張|张[zhang1] / classifier for paintings etc / variant of 劃|划[hua4]