فسق doesn't appear in Hans Wehr's Modern Standard Arabic dictionary, but Lane's Arabic-English Lexicon has 3 entries for it, distinguished by diacritics. Select one below for the full classical Arabic definition.

• فَسَقَ Form 1

  1 فَسَقَ ذ is said to signify primarily It (a thing) went forth, from another thing, in a bad, or corrupt, manner. (Msb.) One says, فَسَقَتِ الرُّطَبَةُ, (S, O, Msb,) or فَسَقَتِ الرُّطَبَةُ عَنْ قِشْرِهَا, (K,) The fres…

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• فِسْقٌ

  فِسْقٌ ذ is an inf. n., (S, O, K,) or a simple subst., (Msb,) from فَسَقَ [q. v]: (S, O, Msb, K:) unless as signifying [simply] A going forth, or a departure, it is said to be a word unknown before ElIslám, and to have b…

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• فُسَقٌ

  فُسَقٌ ذ (Lth, O, K) and , (Lth, S, O, K,) applied to a man, Always characterized by فِسْق. (Lth, S, O, K.) -b2- يَافُسَقُ means يَا أَيُّهَا الفَاسِقُ [O thou فَاسِق]; (S, O, K;) like يَا خُبَثُ, meaning يَا أَيُّهَا ان…

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