| refuel | (verb) take on more fuel, as of a plane, ship, or car | - |
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| (verb) provide with additional fuel, as of aircraft, ships, and cars | - |
| refund | (verb) pay back | Synonyms: give back, repay, return |
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| refurbish | (verb) make brighter and prettier | Synonyms: freshen up, renovate |
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| refurnish | (verb) furnish with new or different furniture | - |
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| refuse | (verb) show unwillingness towards | Synonyms: decline |
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| (verb) not accept as true | Synonyms: decline, pass up, reject, turn down |
| (verb) refuse to let have | Synonyms: deny |
| (verb) refuse entrance or membership | Synonyms: reject, turn away, turn down |
| (verb) elude, especially in a baffling way | Synonyms: defy, resist |
| (verb) resist immunologically the introduction of some foreign tissue or organ | Synonyms: reject, resist |
| refute | (verb) prove to be false or incorrect | Synonyms: controvert, rebut |
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| (verb) overthrow by argument, evidence, or proof | Synonyms: rebut |