(MOVE LIPS) [verb] [T] - to bring (your lips) tightly together so that they form a rounded shape, usually as an expression of disapproval"I don't approve of that kind of language," she said, pursing (up) her lips.The teacher looked at Billy with pursed lips. "Stop that immediately," he said.
PURSE
Meaning of PURSE in English
Cambridge English vocab. Кембриджский английский словарь. 2012