expression, ichidan verb
find fault over trifles; get angry over minor things; raise one's eyebrows
Idiomatic expression used when someone gets upset or scolds over trivial matters. The literal image is raising the outer corner of the eye (目くじら) in anger. Often used in negative requests or admonitions, such as 目くじらを立てるな.
See also: 目くじらを立てる
小さなミスにいちいち目くじらを立てるのはやめてください。
Please stop finding fault with every little mistake.
彼は部下の遅刻に目くじらを立ててばかりいる。
He's always getting angry over his subordinates' tardiness.