تفاسأ doesn't appear in Hans Wehr's Modern Standard Arabic dictionary, but Lane's Arabic-English Lexicon has an entry for it. Select the entry below for the full classical Arabic definition.

• تفاسأ Form 6

  6 تفاسأ ذ , and تفاسى, (M, O, TA,) He (a man) protruded (M, O, TA) his posteriors, (M,) or his back, (O,) or both. (TA.)…

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