Definition of well-day 

: a day characterized by one's freedom from sickness the victim of a slight, ramshackly physique … never knowing a well-day— V. L. Parrington specifically : one free from attacks of a recurrent disorder repeated cold and hot fits … with one or more well-days between them — Michael Underwood

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First Known Use of well-day

1631, in the meaning defined above

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The first known use of well-day was in 1631

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one that holds something together

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