Dissolve
You see a bully take an insect and dissolve it in some acid. Bullies are messed up, mean people. They do awful things that normal kids and people wouldn't do... like dissolve a living creature.
Actually... try to forget this one. Don't think about a bully dissolving things in acid. Think happy thoughts. Like... the bully getting dissolved instead and all the little insects coming back to life and being happy.
ゆう
None
None
The only bullies heartless enough to dissolve insects like this are youths (ゆう). Do you really think an adult would melt a harmless critter? No. Only inexperienced youths could be so cruel.
When you first read this and you pictured the bully dissolving the insect, you pictured them as a youth, right? See? It makes complete sense.