تثولت 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.

• تثوّلت Form 5

  5 تثوّلت النَّحْلُ تثولت النحل The bees collected themselves together, and became dense. (M, K.) See also 7. -b2- تثوّل عَلَيْهِ He, (a man, TA,) or they, (a company of men, S, M,) assailed him, or overcame him, with rev…

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