What is the meaning of "dodgy idea / character" ?
Don't trust him - he's a really dodgy character.

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"Dodgy" means that the person cannot be trusted because he/she will "dodge" the truth, will try to keep you from knowing the truth about them, because they are not a good person, they will pretend to be something they are not.

"dodgy" means unreliable or tricky or uncertain

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It's more British than American English, in case you are wondering.

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it means a man/idea like  fox  that very  foxy