sleeper cell

A sleeper cell is a person who remains a dormant member of a group while belonging to another group for undisclosed reasons. Usually the sleeper cell status is kept a secret.

Those terrorists pretending to be normal students were the ultimate sleeper cells.

Why didn't you tell me you were half Asian? You're such a sleeper cell!

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ligament

Someone who has a lot of connections and enjoys introducing people to one another.

Person 1: I'd really like to meet Bill Gates.

Person 2: I'm sure Bob will introduce you, he's such a ligament.

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