flake

n. An unreliable person; someone who agrees to do something, but never follows through.

1. John called in sick to work again today. He's such a flake.

2. Mary said she would do the research for our project, but it's been a week and she hasn't done a thing. She's such a flake.

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plead the fifth

v. To decline to give self-incriminating information. Refers to the fifth amendment of the US Constitution, which states that no citizen "shall be compelled in any criminal case to be a witness against himself..."

Joe: Bob, did you ever do drugs in high school?

Bob: I'm gonna plead the fifth on that one, Joe.

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