noun, noun or participle which takes 'suru'
drinking together; carousing
Refers to a group gathering for drinks, often with a convivial or festive atmosphere. Can be used as a noun or with する.
昨夜は同僚と会飲して遅くなった。
Last night I went drinking with colleagues and got home late.
会飲の席で新しい企画が
A new project was born at the drinking party.