Entries on ثجو in 2 Arabic dictionaries by the authors Habib Anthony Salmone, An Advanced Learner's Arabic-English Dictionary and Murtaḍa al-Zabīdī, Tāj al-ʿArūs fī Jawāhir al-Qamūs
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ثجو
ثَجَا(n. ac. ثَجْو)
a. Was silent.