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hike (something) up
to raise something, such as prices, interest rates, a skirt, pants legs, etc. The grocery store is always hiking prices up. She hiked up her skirt so she could wade across the creek.
1. To pull up or raise something with a sudden motion, especially a piece of clothing: He hiked up his pants when we crossed the stream. She hiked her skirt up so it wouldn't get wet.
2. To raise or increase something in amount, especially abruptly: Vendors hiked up prices at the end of summer. The contractor hiked up the estimate of the amount of days needed to build the garage.