استفذبه 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.

• استفذّبِهِ Form 10

  10 استفذّبِهِ ذ He was, or became, alone; inde pendent of others; without any to share, or participate, with him; in it: (K, TA:) you say, استفذّ عَلَىَّ بِاالأَمْرِ He was, or became, alone, or independent, exclusively …

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