Meaning of だいやく in Japanese

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Definition of だいやく

だいやく(daiyaku) 【代役】

(n) substitute (e.g. actor); substitution; stand-in; double
彼は父親の代役をした。
He was substituted for his father.

なだいやくしゃ(nadaiyakusha) 【名題役者】

だいやくしん(daiyakushin) 【大躍進】

(n) Great Leap Forward (failed attempt to industrialize China and increase agricultural production, from 1958-1960)
(n, vs) significant breakthrough; great strides