To twist or contort the body, often as a result of discomfort or embarrassment.

मचलना

English Usage: He started to squirm when asked about his grades.

Hindi Usage: जब उससे उसके ग्रेड्स के बारे में पूछा गया तो वह मचलने लगा।

A twisting or contorted motion, often associated with discomfort.

तड़प

English Usage: The child had a fit and began to squirm in his seat.

Hindi Usage: बच्चा झगड़ा कर रहा था और अपनी सीट पर तड़पने लगा।