The same as 'ereb -- wait.
see HEBREW 'ereb
H696. oreb
[אֹ֫רֶב] noun [masculine] ambuscade only figurative —
a. אָרְבּוֺ יָשִׂים Jeremiah 9:7 i.e. he planneth treachery.
b. אָרְבָּם their intrigue Hosea 7:6 compare Nowp.126.