duck out

verb

Meaning

To depart quickly or exit abruptly by way of, especially in a manner which does not attract notice and before a meeting, event, etc. has concluded.
To move or act so as to achieve avoidance, escape, or evasion.
To depart quickly or exit abruptly, especially in a manner which does not attract notice and before a meeting, event, etc. has concluded.
To avoid a debt; to skip out on a bill.

Etymology / origin

Possibly an allusion to the abrupt manner in which a swimming duck can dive and disappear beneath the surface of the water.

Sources

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