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I want to use idiomatic phrases to give my writing a casual tone. Please tell me if I should use apostrophes to indicate the phrase; it’s difficult for a foreigner to interpret something that doesn’t make literal sense.
Example of an idiom
get in on the GROUND floor
become part of an enterprise in its early stages. informal
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Hi,
hair's width

Clive
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hairs width
 Clive's reply was promoted to an answer.