Tweak

ajustement

(slight adjustment or modification)

coup sec

(sharp pinch or jerk; twist or twitch; as, a tweak of the nose)

retouche

(slight adjustment or modification)

ajuster

(to slightly adjust or modify)

fignoler

(to slightly adjust or modify)

personnaliser

(to slightly adjust or modify)

retoucher

(to slightly adjust or modify)

tordre

(to pinch and pull with a sudden jerk and twist; to twitch)