the practice of buying a full bottle of liquor or other alcoholic beverage at a bar and having the bartender keep the unfinished bottle until the purchaser's next visit

to keep one's own bottle of liquor or other alcoholic beverage at a bar

Alternative spelling of ボトルキープ

a favorite

service / giving away something or doing something for free, as a gift or free service for someone / maintenance

keeping, holding, making sure of / keep (main tower of a castle or fortress)

to keep, to hold, to make sure of

kip (unit of currency in Laos)

quipu

bottle / (specifically) bottle of alcohol