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Let say, A and B work in the same office. Every time A talks to B about his idea or working style, B always takes that idea to his boss and acts as if it was his own idea.

What are words, phrases or idioms that I can use to call B?

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You mean like "a two-faced lying sack of sh!t?" –  Jim Jul 21 at 5:17
    
@Jim No. You get no credit for that. –  Kris Jul 21 at 5:26
    
How about idea thief? –  R Sahu Jul 21 at 5:38
    
Why doesn't A speak to the boss himself, rather than talking to B? It seems to me as if you are looking at the dynamics of group working relationships which are often far more complex than they might at fist seem. The relationship between people who 'do' and people who 'sell' are explored in depth by Steinbeck in Of Mice and Men. –  WS2 Jul 21 at 5:48
    
A thief of intellectual property? –  rhetorician Jul 21 at 6:28

3 Answers 3

According to the American Heritage Dictionary, steal (someone's) thunder means

To use, appropriate, or preempt the use of another's idea, especially to one's own advantage and without consent by the originator.

The thief could be called a thunder stealer.

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The word plagiarist will work for you.

Plagiarism is the act of passing off someone else's work as your own.

It is used in much wider contexts than the office environment that you refer to but is perfectly usable here.

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I think double-dealing may fit you description:

  • acting in bad faith; deception by pretending to entertain one set of intentions while acting under the influence of another.

  • duplicity or deceit; treachery.

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How? How do the above definitions and the OP's situation compare? –  Kris Jul 21 at 5:29
    
The description is very clear, B behaves in a friendly way to A to get information from him. But then B with his boss he behaves as if information was his own to benefit from it. –  Josh61 Jul 21 at 5:34

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