pass out （因病痛、受伤或醉酒）昏迷，失去知觉。
= to become unconscious for a short time, for example when ill, badly hurt, or drunk
bring sb in 吸收…为成员；请…做。
bring in ①把…拿进来，带进来，引进；②收获（庄稼等）；③赚（钱），挣（钱）。

【例句】
I was hit on the head and passed out.
我被击中了头部，一下就昏过去了。

We need to bring in an expert to deal with this problem.
我们需要请个专家来处理这个问题。