Extended Strong's Greek Lexicon (Abbott-Smith based)
to alarm
Usage: θροέω, -ῶ (θρόος, a noise, tumult), [in LXX: Sng.5:4 (הָמָה * ;] in cl., __1. to cry aloud, make an outcry. __2. to utter aloud. __3. In NT (and LXX), pass., to be troubled, as by an alarm: Mat.24:6, Mrk.13:7, Luk.24:37 (WH, mg.), 2Th.2:2 (cf. Kennedy, Sources, 126).† (AS)