I tried really hard to wake you up, but it didn't work.
We don't want to wake our sleeping baby, so please don't buzz the intercom.
You are absolutely correct, Viet! We should definitely wake Koichi up right now!
You've seen 起きる which is "to wake up." This is similar, except you are doing the waking up, which makes the meaning of this word to wake someone up. How do you differentiate between this and 起きる? Because of the す on the end. You wake someone up violently, wrenching their neck. They turn around and sue (す) you, making you wish you never woke them up.
The reading is the same as 起きる, so as long as you know that word you should be able to read this one. Of course, you can also imagine them yelling "OH!" when you shake them awake too, if that helps.