to ask someone to behave properly / asking someone to improve or do better
The Government, pulled it’s socks up, by sacking the cabinet minister, after he faced corruption charges, to save the party’s image.
John will lose a job unless he pulls his socks up and starts doing a lot better.
The coach asked the player to pull his socks up, or he will lose a spot in the soccer team.
It’s not okay, that you always arrive late, you need to pull your socks up.
The teacher told Mary to pull her socks up because her grades weren’t good.