godan verb (-ru), intransitive verb
creep up; ride up; slide up
Describes something gradually moving upward, often unintentionally, such as clothing riding up or an object slipping upward.
歩いているうちに靴下がずり上がってきた。
My socks crept up while I was walking.
スカートがずり上がらないように気
Be careful so your skirt doesn't ride up.