earn or burn
 v. phr.— «Most airlines let you “earn or burn” miles in a variety of ways, such as using a credit card linked to the account or spending money or miles with one of the airline’s retail, restaurant, travel or financial partners.» —“Warnings on frequent-flier miles” by Kathleen Pender San Francisco Chronicle Nov. 18, 2007. (source: Double-Tongued Dictionary)

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