quick one
noun informal uk/ˈkwɪk ˌwʌn/ us/ˈkwɪk ˌwʌn/
have a quick one （去某地之前）喝上一杯（通常指酒）
to have a drink, usually an alcoholic drink, just before going somewhere
Do we have time for a quick one before the train arrives? 火车进站前我们还有时间喝上一杯吗？