1. The meaning crash is to collide with, to hit or to strike.
2. Crash also means to move with force (causing noise or damage).
3. crash means to show up without an invitation, and is informal.

Examples:
1. The dog slipped on the wet floor and crashed into the table.
2. The surfer lost control of his board and crashed into the boat.
3. Have you ever crashed a party?

1. The meaning of crush is to break up into pieces or make something loose its shape.
2. Crush also means to defeat using a lot of force.
3. Crush also means to disappoint deeply, or to make someone feel very sad.

Examples:
1. Making peanut butter is easy. All you need to do is crush peanuts in the blender.
2. The rebellion was crushed by the government without any difficulty.
3. I was crushed when my boyfriend broke up with me.