What's "build up" mean and when's it used?
Native speaker’s answer
Rebecca
"Build up" is a phrasal verb that means for something to accumulate or assemble, or to become more intense. It can also be used for fitness when referring to making one's body stronger. It can be used in relation to emotions like excitement, and anticipation, or when collecting or gathering materials. Ex: I've been building up my collection of vintage toy cars so that I can sell them at an auction. Ex: My anxiety built up so much, but when I went on stage, it wasn't as bad as I thought it'd be. Ex: There's a build-up of pressure in the pipes, so they could burst.