辅导书上说的没错，look for 确实有“期待”的意思。归纳起来，该短语有以下三种主要用法：
(1) 寻找。如：
I’ve looked for it everywhere. 我到处找过它了。
You are looking for trouble. 你是在自找麻烦。
(2) 期待，指望。如：
We shall be looking for an improvement in your work this term. 我们期待你这学期学习进步。
It’s too soon yet to look for results. 现在就指望有结果，未免为时过早。
(3)找(麻烦)，找(苦头)吃。如：
That foolish fellow is looking for trouble. 那个愚蠢的家伙在自找麻烦。
You’re looking for trouble if you say things like that to me! 你要是那个样子对我说话，就是在自找苦头！