تظلم 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.

• تَظَلَّمَ Form 5

  5 تَظَلَّمَ تظلّم مِنْهُ (T, S, M, K, [but in some copies of the S, منه is omitted,]) He complained of his ظُلْم [or wrongdoing, &c.], (S, M, K,) إِلَى الحَاكِمِ [to the judge]: (T:) in some copies of the S, تُظُلِّمَ. (…

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