predrinking
noun
[ ˈpriːdrɪŋkɪŋ ]
• the action or practice of drinking alcohol, especially in large quantities, before going out socially.
• "80 per cent of females studied said they would indulge in predrinking before heading to a pub or club"
predrink
verb
• drink alcohol, especially in large quantities, before going out socially.
• "at university, we would tend to predrink in the flat before heading out"