Rashi on Deuteronomy 1:29/רש"י על דברים א׳:כ״ט

1לא תערצון — This is an expression denoting breaking, as the Targum translates it: You should not let yourselves be broken by them. Similar to it is, (Job 30:6) “To dwell in ערוץ נחלים”, i.e. in the fissure of the valleys.