Meaning of 一子相伝 in Japanese
Definition of 一子相伝
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(n) transmission of the secrets of an art, craft, trade or learning from father to only one child
一子相伝の技と言うわりには、彼の蹴りは大した事はないね。
For a guy who was chosen by his father as the only son to be taught the secrets of this martial art, he doesn't have much of a kick.