loins /lɔɪnz/noun 2phrases 2 noun[plural only]2 •(euphemistic) The pubic region. •(euphemistic) The reproductive organs.Neuerthelesse, thou shalt not build the house, but thy sonne that shall come foorth out of thy loynes, hee shall build the house vnto my Name. — 1611 Phrases with loins fruit of one's loinsOne's child or, collectively, one's children or descendants. gird up one's loinsTo prepare oneself for something demanding.