いりぐち
entrance
The mouth you go in by, which is exactly how the word is put together. The same 入 you duck your head through in 入る, and the same 口 that opens 唇. Over that way: いりぐち.
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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.