せまい
narrow, cramped
An animal held between two walls with nowhere at all to turn round. So せ my まい room, then: two walls and no way to turn: せまい.
細い ほそい is thin as in a thread or a finger. 狭い is narrow as in not enough room, and 広い ひろい is its opposite.
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Emaki is not affiliated with, or endorsed by, Kaishi 1.5k or its authors. The word, reading and meaning come from the Kaishi 1.5k deck, used with their permission. The mnemonic, the note and the kanji breakdown are original work, published under CC BY-SA 4.0.