(v.) to drink a toast to someone; to express good wishes before you drink to someone, similar to saying "cheers!" / "bottoms up!"
Definitions (粵典–words.hk)
語句
慶祝或者喜慶時候嘅説話,之後大家會一齊舉杯或碰杯,然後飲晒杯裏面嘅飲料(勝有「盡」嘅意思,又可避諱「乾」字);同乾杯 a phase used when toasting, like saying "cheers !" to each others before drinking wine; literally, drink up all