When used with reference to a dining table, the term "cover" refers to

Cover – this term actually has three meanings. One, it is the cloche or lid that keeps the food warm. Two, it is the place setting on the table (flatware, glasses, napkin, etc.). Three, it is the number of people served – “We had 500 covers tonight.

Explanation:

In this context, your refering to table, so i'd go with it is the place setting on the table, or just tablecloth

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