Be riding for a fall phrase
To be doing something too confidently, and such that might result in something unpleasant, such as failure, problems, or disaster, happening.
Anyone who invests in such an untrustworthy company is riding for a fall.
I think the politician is riding for a fall with his tirade of abuse against working-class voters.
This phrase originated as a late 19th-century horse-riding expression, meaning to ride a horse, especially in the hunting field, in such a way as to make an accident likely.
Used to imply that someone is acting as if he or she is demure, innocent, sincere or reserved but they may be not
Don’t be fooled by Jennie's good behaviour. She looked as if butter wouldn't melt in her mouth.