When a person need study a lot, we say "tienes que hincar los codos" go out running: salir corriendo. for example. You are in a shop, and you see come an old boyfriend that you do not want to see, you go out of shop quickly. we say: "salí corriendo" (evidently you do not running., you just go out quickly) también decimos "salí por pies"

Hi, "Hincar los codos"= knuckle down or to hit the books, to burn the midnight oil... The other "to be in a harry to get out of" Cheers!