(kōu) to dig out; to pick out (with one's fingers); to carve; to cut; to study meticulously; to lift one's clothes; stingy; miserly
(kōuzìyǎn) to be fastidious about phrasing, diction, or choice of words
(kōuzìyǎnr) erhua variant of 摳字眼|抠字眼[kou1 zi4 yan3]