| A | B |
|---|
| tickle someone's funny bone | to make someone laugh |
| crack up | to laugh loudly |
| double up | to laugh so harsd that someone almost feels pain |
| for laughs | for the sole purpose of having fun |
| lighten up | to make or become less serious |
| keep a straight face | to try to show no emotion when one is really laughing inside |
| no laughing matter | a matter to be taken seriously |
| mean business | to be serious about a situation |
| hit home | to make a serious impression on someone |
