かぎ
kagiru

Godan Verb (ru)

1. to restrict; to limit; to confine

Transitive
金持 かねもちが かならずしも幸福 こうふくとは かぎらない。
kanemochiga kanarazushimo kōfukutowa kagiranai.
The rich are not always happy.
Godan Verb (ru)

2. to be restricted to; to be limited to; to be confined to

Intransitive
Godan Verb (ru)

3. to be best (for); to be the best plan; to be the only way (to)

Intransitive
あつ つめたいビールに かぎる。
atsui hiwa tsumetai biiruni kagiru.
There is nothing like cold beer on a hot day.