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A gerund is a present participle used as a noun (e.g. making, solving). In a compound formed from a noun plus a gerund, the use of a hyphen depends on how the compound is being used in the sentence.
When compounds formed from a noun plus a gerund function as nouns, they are not hyphenated.
Some noun-plus-gerund compounds are written as one word:
Others are written as separate words:
When a noun-plus-gerund compound that is normally written as two separate words is used as an adjective before a noun, it should be hyphenated:
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