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notion

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have half a notion to do something

 and have half a mind to do something

Fig. to have almost decided to do something, especially something unpleasant. I have half a mind to go off and leave you here. The cook had half a notion to serve cold chicken.

See also: half, have, notion

not have the foggiest notion

to not know anything at all about something not have the faintest idea I don't have the foggiest notion what that book is about.

See also: foggy, have, not, notion