duck

1. Originally the verb "dive, dip in water", a derivative of which gave the bird's name (in effect "diver, dipper"). An earlier English name for the bird, in various forms such as ænid, enid, enede, ende, extinct 1400s, was cognate with Latin anat-. The verbal sense "lower the head" is later: like dipping in water but without the water.

2. The kind of cloth is unrelated. 'Duck tape' is attested considerably earlier than 'duct tape', but it's not obvious that the latter is derived by alteration of the former: it might well be an independent invention coincidentally similar.

Noun. Term of endearment. Colloq. Northern England.

All along the the backwater,
Through the rushes tall,
Ducks are a-dabbling,
Up tails all!

Ducks' tails, drakes' tails,
Yellow feet a-quiver,
Yellow bills all out of sight
Busy in the river!
- Kenneth Grahame, 'Duck's Ditty'.

Or my favorite: A man, a lawyer, a redneck, a nun, a blonde, a dog, and a priest walk into a bar. The bartender looks up and says, "Is this some kind of joke?"

Ah, my favorite variant of that is "A nun, a priest, and a Druid walk into a bar. You'd think one of them would've seen it."

Three men walked into a bar, the fourth one ducked.

Citation (fabric) on cleg.

Cricket jargon - a score of 0 for an individual batsman. Originates from expression "to make a duck's egg". Embarrassing.