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

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

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend