learn sth without a teacher; self-taught “过了二十年又是一个……”阿Q在百忙中，“～” 的说出半句从来不说的话。(《鲁迅选集》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.
无师自通
self-taught
无师自通wú shī zì tōnɡ
没有老师指导，靠自学也能学好。self-taught, taught by oneself with no formal instruction, learned without teacher