Japanese

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For pronunciation and definitions of えっち – see the following entry.
エッチ
[noun] (dated) Alternative form of エイチ (eichi, aitch)
エッチ
[adjective] dirty; lewd; perverted
[adjective] sexual
[noun] sexual activity
[verb] to fuck; to have sex with
(This term, えっち (etchi), is the hiragana spelling of the above term.)