Wiktionary
puckering up
vb. (present participle of pucker up English)
Usage examples of "puckering up".
His arms lifted from his side in a gesture of helplessness, lips puckering up.
Aubrey demanded, patting her hand against Ethan's cheek and puckering up.
She took Mirmalar herself, for the little girl was puckering up to cry again.
A great, long, jagged scar, still raw and livid and puckering up the cheek where it had been roughly, clumsily stitched, ran the whole length of her face from the hairline of the temple to the corner of the soft, round chin.