sitting duck

all duck or no dinner

All or nothing.

break one's duck

To do something for the first time.

dead duck

One who is in serious danger or trouble.

duck down

To crouch in order to hide or protect oneself.

duck off

To lie low; to hide.

duck out

To depart quickly or exit abruptly, especially in a manner which does not attract notice and before a meeting, event, etc. has concluded.

duck soup

Something which is easy; a piece of cake.

odd duck

An unusual person, especially one with an idiosyncratic personality or peculiar behavioral characteristics.