Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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burn the midnight oil to stay awake very late for work or study.
linseed oil a yellowish oil that comes from the seed of flax plants. It is used in making oil paints, ink, and linoleum.
oil well a well from which petroleum is drawn or pumped.
olive oil oil pressed from ripe olives. Olive oil is used for cooking.