kashikiriburo o yoyakusuru.

I reserve the private bath.

Breakdown of kashikiriburo o yoyakusuru.

• を: direct object particle
• 予約よやくする: to reserve
• 貸切風呂かしきりぶろ: a private reservable bath

Questions & Answers about kashikiriburo o yoyakusuru.

How do you read 貸切風呂を予約する?

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.

What exactly does 貸切風呂 mean?

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.

Why is there no particle between 貸切 and 風呂?

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.