noun
corner of the eye
Refers to the outer or inner corner of the eye. Often used in the idiom 目くじらを立てる (to find fault with a minor thing, literally 'to raise the corner of one's eye').
彼はいつも小さなことで目くじらを立てる。
He always finds fault with trivial things.
目くじらを立てて怒るほどのことではない。
It's not something to get so worked up about.
Compound of 目 (me, 'eye') and くじら (kujira). The second element is likely a phonetic shift from くじり (kujiri, 'twist' or 'corner'), referring to the angled shape of the eye corner. The exact derivation is uncertain.