One of the mysteries of the English language finally explained.
1That is maintained in the best order or condition; most carefully cared for or looked after.
2Of a secret: that is known to very few people. Now used especially with reference to something good or desirable that is not generally known about.
Late 16th century; earliest use found in Vicary's Profitable Treatise Anatomy. From best + the past participle of keep, after well-kept.
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