verb / noun
laugh
LAF/læf/
A vocal response expressing amusement or ridicule.
She laughs heartily, leaning forward with one hand on her belly.

Etymology
Old English hlæhhan covered laughing, rejoicing, and deriding, so laughter could express either pleasure or mockery. The modern amusement sense continues the pleasurable side of that older range.
In context
So when you do a real smile, try to actually laugh. It sounds stupid, but I promise you, whenever I am on set with professional models, a lot of times we laugh out loud.
More examples
- A loud laugh escapes him when he sees the costume.
- Please don't laugh at her mistake.
- That silly movie is always good for a laugh.
Forms
laugh · laughs · laughed · laughing
laughter noun — The sound or act of laughing.