畫地自限

lit. to draw a line on the ground to keep within (idiom) / fig. to impose restrictions on oneself

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

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

self / oneself / from / since / naturally / surely

to limit / to restrict / (bound form) limit / bound

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