Definition of "laugh"
laugh
/laːf/
verb
third-person singular simple present laughs, present participle laughing, simple past and past participle laughed
(intransitive) To show mirth, satisfaction, or derision, by peculiar movement of the muscles of the face, particularly of the mouth, causing a lighting up of the face and eyes, and usually accompanied by the emission of explosive or chuckling sounds from the chest and throat; to indulge in laughter.