Definition of «cup oil»

The phrase "cup oil" refers to the act of pouring oil into a cup or measuring it using a cup.

Whisk in lime juice, cilantro, and remaining 1/4 cup oil until combined. (drflannery.com)
Toss potatoes with 1/4 cup oil on a rimmed baking sheet; season with salt and pepper. (bonappetit.com)
So if you want 1 full cup of dressing, it's 3/4 cup oil + 1/4 cup vinegar = 1 cup vinaigrette. (glutenfreeonashoestring.com)
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