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Definition of Jack Frost noun from the Oxford Advanced Learner's Dictionary

Jack Frost

noun

/ˌdʒæk ˈfrɒst/

/ˌdʒæk ˈfrɔːst/

[singular] (old-fashioned)

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frost, considered as a person
- Jack Frost was threatening to kill the new plants.

See Jack Frost in the Oxford Advanced American Dictionary

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