riding for a fall
riding for a fall {adj. phr.}
Behaving in an overconfident way that is likely to lead to trouble; being too sure of yourself; doing something dangerous.
The student who does not study for exams is riding for a fall.
Mr. Smith has borrowed too much money on his home. He is riding for a fall.
Compare: COME A CROPPER (2).
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Source: A Dictionary of American Idioms