use one's noggin

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use one's noggin (third-person singular simple present uses one's noggin, present participle using one's noggin, simple past and past participle used one's noggin)

1. (idiomatic) To think, especially in a careful or clever manner.
   • 1984 August 8, “Money: Small Business”, in Sydney Morning Herald, Australia:

     The investor is advised to use his noggin considerably when investigating different superannuation programs.

• use one's head