Japanese

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For pronunciation and definitions of いたす – see the following entry.
致す
[verb] to deliver; to send
[verb] to have an effect; to lead to a consequence, especially a bad one
[verb] (humble) to do: the humble version of 為る (suru)
[verb] (slang) to masturbate
[verb] (slang) to have sex
(This term, いたす (itasu), is the hiragana spelling of the above term.)