noun
Refers to intentional or decorative folds in fabric, paper, or similar materials, such as pleats in a skirt or tucks in sewing.
スカートのひだがきれいに出ている。
The pleats of the skirt are nicely defined.
カーテンのひだを整える。
I arrange the gathers of the curtain.
noun
Used for natural or irregular folds, such as in mountains, skin, or crumpled paper. Often implies a ridge or depression.
山のひだに小さな集落がある。
There is a small settlement in the folds of the mountain.
紙に深いひだがついてしまった。
A deep crease formed in the paper.
noun
hidden detail; nuance; subtlety
Figurative use: a subtle aspect, hidden complexity, or fine point that is not immediately obvious. Often used in expressions like ひだのある (nuanced) or ひだを読む (read between the lines).
彼の話には深いひだがある。
His story has deep nuances.
この文章のひだを読み取るのは難しい。
It's difficult to grasp the subtleties of this text.
noun
lamella; gill (of a mushroom)
Technical biological term for the thin, plate-like structures on the underside of a mushroom cap.
キノコのひだの色で種類を見分ける。
Identify the mushroom species by the color of its gills.
The origin is uncertain. Possibly related to the verb ひだる (to fold), but the exact derivation is unclear.