Breakdown of kashikiriburo o yoyakusuru.

Questions & Answers about kashikiriburo o yoyakusuru.
It is read:
かしきりぶろ を よやくする
- 貸切風呂(かしきりぶろ) = private bath / reserved bath
- を = object marker
- 予約する(よやくする) = to reserve / to book
So the whole sentence means to reserve a private bath.
貸切風呂 is a compound noun:
- 貸切(かしきり) = reserved for private use / chartered
- 風呂(ふろ) = bath
Together, 貸切風呂 means a private bath, especially one at a hotel, ryokan, or hot spring facility that you reserve for your own use.
This is not just any bathtub at home. It usually refers to a bath that can be used privately by a person, couple, or family for a set time.
Because 貸切風呂 is a single compound noun, not two separate words in a phrase.
Japanese often combines nouns like this:
- 温泉旅館 = hot spring inn
- 電車駅 would sound odd, but many noun compounds are common
- 貸切風呂 = private bath
So 貸切 is directly modifying 風呂 as part of one word. You do not say 貸切の風呂 here in the normal vocabulary item.