‛Ereb (עֶרֶב, Strong's #6153), “evening, night.” The noun ‛ereb appears about 130 times and in all periods. This word represents the time of the day immediately preceding and following the setting of the sun. During this period, the dove returned to Noah’s ark (Gen. 8:11). Since it was cool, women went to the wells for water in the “evening” (Gen. 24:11). It was at “evening” that David walked around on top of his roof to refresh himself and cool off, and observed Bathsheba taking a bath (2 Sam. 11:2). In its first biblical appearance, ‛ereb marks the “opening of a day”: “And the evening and the morning were the first day” (Gen. 1:5). The phrase “between the evenings” means the period between sunset and darkness, “twilight” (Exod. 12:6; KJV, “in the evening”).
Second, in a late poetical use, the word can mean “night”: “When I lie down, I say, When shall I arise, and the night be gone? And I am full of tossings to and fro unto the dawning of the day” (Job 7:4).