hit on的意思？

hit on的音标：hit on的英式发音音标为：[hit ɔn]hit on的美式发音音标为：[hɪt ɑn]...

His jaw was broken after he was hit on the head.他的头部受重击之后下颌骨折了。I hit on this book in a small bookshop.我在一家小书店里偶然发现了这本书.Many a bright idea has been hit on by accident.许多好主意都是偶然想到的....