"hunch down" is correct and usable in written English.
It means to crouch down or bend down for a short period of time. For example, "The cat hunch down and hid under the bed from the loud noise."
But the men hunch down, their eyes fixed on the ground.
Bartoli, seeded 15, using two hands on both her forehand and backhand, seems to hunch down, using a low centre of gravity to hit low and hard.
By the end of an hour, children so small that their partnering parents had to hunch down to hold them properly in a ballroom "frame" had more or less gotten the idea.
Half a foot taller than the deputy, Lee tried to hunch down as he held his hands up.
Only then could he hunch down on the floor of the getaway vehicle and avoid the growing potential riot situation.
Can your monitor sit on a platform so you don't have to hunch down and strain your neck while looking at it?
Park is endearingly gauche; he hunches down in his chair and speaks in a murmur.
By hunching down into my own embrace and staring hard at my feet, I tried to make myself go away.
For nearly a half-hour I watched and listened, hunching down low so as not to distract or disrupt them.
If a shipping container door slams somewhere nearby, Gunner hunches down and bolts for an open cage door.
He tried to hide from the wind by hunching down behind the back of the house, only to find the wind and rain swirling in from every direction.
