To hit the beach is just a casual way of saying “go to the beach,” and catching some rays means getting a tan.
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Similarly, when you're hot, your body moves some core fluid to the outside of your body (aka sweat) to cool you down. However, this loss of core fluid can lead to dehydration. While these processes are effective at keeping you cool, they tax your body and can leave you feeling fatigued.
Beach. The beach (or shore) zone of unconsolidated material that extends from the mean low water line to the place where there is a marked change in material or physiographic form (e.g. dunefoot), or to the line of permanent vegetation (the effective limit of storm waves and storm surge), i.e. to the coastline.