Entries on دشو in 3 Arabic dictionaries by the authors Supplément aux dictionnaires arabes by Reinhart Dozy, Murtaḍa al-Zabīdī, Tāj al-ʿArūs fī Jawāhir al-Qamūs and Habib Anthony Salmone, An Advanced Learner's Arabic-English Dictionary
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دشو
دَشَا(n. ac. دَشْو)
a. Rushed into the thick of the fight.
تَدَشَّوَa. Eructated, belched.