احتم 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.

• احتمّ Form 8

  8 احتمّ احتم أحتم حتم ٱحتمى He was, or became, anxious, disquieted, or grieved, syn. اهتمّ, (S, TA,) لَهث for him; as though for one near and dear to him: (TA: [see حَمِيمٌ:]) or he was, or became, anxious, disquieted, o…

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