تزلزل 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.

• تَزَلْزَلَ Form R. Q. 2

  R. Q. 2 تَزَلْزَلَ ذ It was, or became, in a state of motion, commotion, agitation, convulsion, or violent motion. (Msb, TA.) You say, تَزَلْزَلَتِ الأَرْضُ (S, Msb, TA) The earth [quaked: or quaked violently:] was, or b…

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