What is "duck down"

Usage examples of "duck down".

I set the duck down on the floor, but instead of beginning to waddle, it instead waited, completely still.

Forced to put the duck down on the sand, she thanked Michael for breakfast and broke off a large crumb of biscuit for her new friend.

He started to duck down under the table low enough to reach Colin with his blade, but stopped in mid-stoop.

Curt edged up to the windows again, and although he had to duck down each time one of those bolts of light shot out, he could take little peeks in between.

If I hadn't happened then to duck down a side street and pass a hotel where a convention for the deaf was being held, there is every chance that my mind would have cracked completely and I would have spent the rest of my life writing the sort of books for which Kafka became famous and dribbling.

When they say goodnight and duck down the passageway to their tiny quarters in the bow, he kisses his fingers and pats them on the head as they pass him.