To be honest I have read this phrase for the first time, Tried to find out what it is about and found this : You're riding home after a day at the beach with your young children. The children have fallen asleep in the backseat. You tell your husband this.
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All that sun must have really worn them out.
Hope this helps as it did help me too.
CliveIf something wears you out, it makes you feel very tired.All that exposure to the sun's heat must have really made them feel very tired.CliveThanks Sir I get it.