noun, する verb
Your versus plan is to attack back. They've already attacked you once, so now it's time for your counter plan.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
I was making a cup of coffee, I pressed a button, and the machine caught on fire. We have to find the cause of the defect and take measures to prevent its recurrence.