1 also duck down [intransitive and transitive]
to lower your head or body very quickly, especially to avoid being seen or hit:
If she hadn't ducked, the ball would have hit her.
duck behind/under etc
Jamie saw his father coming and ducked quickly behind the wall.
Tim ducked down to comb his hair in the mirror.
She ducked her head to look more closely at the inscription.
2 [intransitive always + adverb/preposition]
to move somewhere very quickly, especially to avoid being seen or to get away from someone
The two men ducked into a block of flats and disappeared.
duck out of
She ducked out of the door before he could stop her.
'Wait a minute', he called, ducking back inside.
3 [transitive] informal
to avoid something, especially a difficult or unpleasant duty [= dodge]:
The ruling body wanted to duck the issue of whether players had been cheating.
Glazer ducked a question about his involvement in the bank scandal.
to push someone under water for a short time as a joke
duck somebody under something
Tom grabbed him from behind to duck him under the surface.
duck out of somethingphrasal verb
I always ducked out of history lessons at school.