Verb (5-dan, す, transitive)
1. to break; to destroy; to demolish
それは何かを壊す道具のように見えるけど。That looks like a tool for breaking things, though.
2. to wreck; to ruin; to spoil; to damage
冷たい水ばかり飲んでるとあなたすぐお腹壊しちゃうから。If you keep drinking only cold water, you'll get an upset stomach right away.
3. to break (a bill, etc.)