اكثبه 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.

• اكثبهُ Form 4

  4 اكثبهُ ذ , and اكثب لَهُ, and مِنْهُ, (K,) and إِلَيْهِ, and , (TA,) and , (K,) He drew near to, or approached, him or it. (K.) إِذَا كَثَبُوكُمْ فَٱرْمُوهُمْ بِالنَّبْلِ When they draw near to you, shoot at them with …

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