Hit on someone:

打某人 ×

勾搭 √

例句：

He's trying to hit on that girl at the party.

他在派對上，嘗試泡那女孩。

拓展：

Hit on something

敲打某物 ×

突然想到某事 √

例句：

He hit on an idea of sending his father a special present.  

他突然想出一個(gè)主意，送給他爸爸一件特別的禮物。

Hit it off:

打某物下來 ×

合得來 √

例句：

These children hit it off well in the kindergarten.

這些小孩在幼兒園里相處得很好。

Hit the light:

打燈 ×

開燈 √

例句：

Could you please hit the light for me?

可以幫我開燈嗎？