circular bento box
A traditional round wooden lunch box, often used for carrying rice and side dishes.
My grandmother packed rice into a circular bento box for me.
something ring-shaped
Colloquial; refers to any ring-shaped object, often used in casual conversation.
Colloquial term for handcuffs, often used in the phrase ワッパをかける (to handcuff someone).
What do you use this ring-shaped thing for?
The police put handcuffs on the suspect.
Kanji spelling; rarely used.
The origin is uncertain. It may be related to 輪 (わ, ring) with a suffix, but the exact derivation is unclear.