N3
に限る
にかぎる
Nothing better than, There's nothing like, Limited to
暑い日は冷たいシャワーを浴びるに限る。
There is nothing better than taking a cold shower on a hot day.
Explanation
「に限る」 has 2 uses
1X is best
Verb (dictionary / ない form) or noun + に限る: from experience, the speaker declares this is the best thing to do or have.
疲れた時は寝るに限る。
There is nothing better than sleep when you are tired.
暑い日は冷たいシャワーを浴びるに限る。
There is nothing better than taking a cold shower on a hot day.
2Limited to
Noun + に限る: in notices, job ads and conditions, "only ..., limited to ...".
パート募集中。但し経験者に限る。
Part-time staff wanted. Experienced applicants only.
アルバイト募集中。ただし、英語ができる人に限る。
They are hiring. However, the position is only limited to people who can speak English.