In a restaurant, covers means the number of guests served in a sitting. Forty covers, do two hundred covers a night, a hundred covers on a Saturday.
It is the industry's basic measure of trade, and it counts diners rather than tables or bills. A cover charge is a separate fee some restaurants add per head. Elsewhere, the covers are the blankets on a bed, and in music a cover is a new recording of somebody else's song. Note cover as a verb, which does an enormous number of jobs in English.
1nouncoversThe number of guests a restaurant serves in a sitting.
“They do about two hundred covers on a Saturday.”
2nounblanketsThe blankets on a bed.
“He pulled the covers over his head at about four in the morning.”
Too few real examples of this word to estimate which sense is commonest.