duck out

Short definition from Wiktionary

Verb

1. 1
   To depart quickly or exit abruptly, especially in a manner which does not attract notice and before a meeting, event, etc. has concluded.
2. 2
   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.
3. 3
   To move or act so as to achieve avoidance, escape, or evasion.
4. 4
   To avoid a debt; to skip out on a bill.