To bend the top of one's body forward while raising one's shoulders.
Don't hunch over your computer if you want to avoid neck problems.
2
To raise (one's shoulders) (while lowering one's head or bending the top of one's body forward); to curve (one's body) forward (sometimes followed by up).
He hunched up his shoulders and stared down at the ground.
3
To walk (somewhere) while hunching one's shoulders.
4
To thrust a hump or protuberance out of (something); to crook, as the back.