becomes larger by being filled with air

If a balloon inflates too much, it could pop!

moves from side to side with very short, quick movements

My mom says the whole house vibrates when I play the drums.  

stop briefly before doing something (often because you are nervous)

I knew my sister would hesitate before jumping into the lake because I told her how cold it was!

not thinking about other people’s feelings

After my injury, some people made insensitive comments about me and my crutches.