This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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verb-intransitive. To remain alive through the winter: sheep that overwintered on the steppe.

verb-intransitive. To pass or spend the winter: We usually overwinter in the Bahamas.

adj. Occurring during the period of winter.

v. To keep or preserve for the winter.

v. To spend the winter (in a particular place).

v. spend the winter

"Frost used to kill them off, but now they "overwinter" and produce more generations each year as they go."

overwintered    overwintering   

spend    pass   

Sprinter    Winter    midwinter    minter    printer    reenter    splinter    sprinter    winter