learn sth without a teacher; self-taught “過了二十年又是一個……”阿Q在百忙中，“～” 的說出半句從來不說的話。(《魯迅選集》上—85) “In twenty years I shall be another.…” In his agitation Ah Q uttered half a saying which he had picked up himself but never used before.
無師自通
self-taught
無師自通wú shī zì tōnɡ
沒有老師指導，靠自學也能學好。self-taught, taught by oneself with no formal instruction, learned without teacher