伤脑筋 shāngnǎojīn HSK7 rack one's brains Definitions Defs Origin Strokes Stroke Words Sentences Sents Showing: rack one's brains All meanings 2 shāngnǎojīn 2 rack one's brains 1troublesome 1 1 sentence for 伤脑筋 (shāngnǎojīn — rack one's brains) 别再为这件小事伤脑筋了。 bié zài wèi zhè jiàn xiǎo shì shāngnǎojīn le. Don't bother your head over such a trivial matter. Source: Dong Chinese Dictionary