expression
both oneself and others; by both oneself and others
Used almost exclusively in the set phrase 自他共に認める (じたともにみとめる), meaning 'acknowledged by both oneself and others' or 'universally recognized'. Rarely appears outside this phrase.
See also: 自他共に認める
彼は自他共に認める努力家だ。
He is a hard worker, acknowledged by both himself and others.
自他共に認める名作と言えるだろう。
It can be called a masterpiece recognized by everyone.
The full set phrase in which 自他共に is almost always used. The standalone 自他共に is rarely encountered.
Compound of 自 (self), 他 (others), 共に (together, both). The phrase literally means 'both self and others together'.