Strengthened from a primary treo (to "dread", "terrify"); to "tremble" or fear -- be afraid, trembling.
Thayer's Greek Lexicon
Strong's 5141: τρέμω
τρέμω; used only in the present and imperfect; from Homer down; to tremble: Mark 5:33; Luke 8:47; Acts 9:6 Rec.; with a participle (cf. Winers Grammar, § 45, 4 a.; (Buttmann, § 144, 15 a.)), to fear, be afraid,2 Peter 2:10. (Synonym: see φοβέω, at the end.)
Mark 5:33 - V-PPA-NFS GRK:φοβηθεῖσα καὶ τρέμουσα εἰδυῖα ὃ NAS: fearing and trembling, aware KJV: fearing and trembling, knowing what INT: having been frightened and trembling knowing what
Luke 8:47 - V-PPA-NFS GRK:οὐκ ἔλαθεν τρέμουσα ἦλθεν καὶ NAS: she came trembling and fell down before KJV: she came trembling, and INT: not she was hid trembling she came and
2 Peter 2:10 - V-PIA-3P GRK:δόξας οὐ τρέμουσιν βλασφημοῦντες NAS: self-willed, they do not tremble when they revile KJV: they are not afraid to speak evil INT: glories not they tremble speaking evil of
