| avenge | (verb) take revenge for a perceived wrong | Synonyms: retaliate, revenge |
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| challenge | (verb) issue a challenge to | - |
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| (verb) take exception to | Synonyms: dispute, gainsay |
| (verb) raise a formal objection in a court of law | Synonyms: take exception |
| (verb) ask for identification | - |
| counterchallenge | (verb) challenge in turn | - |
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| revenge | (verb) take revenge for a perceived wrong | Synonyms: avenge, retaliate |
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| scavenge | (verb) remove unwanted substances from | Synonyms: clean |
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| (verb) feed on carrion or refuse | - |
| (verb) clean refuse from | - |
| (verb) collect discarded material | Synonyms: salvage |