Let’s go ahead and ambush them!
Riku is very impatient, and always tries to anticipate what I'm going to say before I've said it, and it's been really annoying me.
He beat me to the top of Mt. Fuji and then laughed at me for being slow.
If you get there previous to something rotating (回り), you are arriving ahead, or going ahead in anticipation.
This consists of a couple kun'yomi readings put together. You can tell it's kun'yomi because of the hiragana sticking out at the end. In previous levels, you learned both the words 先 and 回る (verb version of 回り). If you know those, you should be able to put them together to learn the reading of this word as well.