[intransitive, transitive] to make the sounds and movements of your face that show you are happy or think something is funny to laugh loudly/aloud/out loud laugh (at/about something) You never laugh at my jokes! The show was hilarious—I couldn't stop laughing. She always makes me laugh. He burst out laughing (= suddenly started laughing). She laughed to cover her nervousness. I told him I was worried but he laughed scornfully. + speech ‘You're crazy!’ she laughed.