فتره 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.

• فتّرهُ Form 2

  2 فتّرهُ ذ , inf. n. تَفْتِيرٌ, He made it (a thing, M, O) to remit, or become allayed or still, after vehemence; and to become gentle after violence. (M, O, * K.) -b2- (tropical:) He made him (a worker) to remit, flag, …

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