leap of faith
noun
An act of believing in or attempting something whose existence or outcome cannot be proved or known: anyone investing in new media today has to make a leap of faith taking a leap of faith is something every entrepreneur must do to uproot these children now requires a leap of faith...
- Policy differences apart, the appointment was always going to be a leap of faith for both men.
- Which brings me to an important realisation: some cosmetic treatments involve a leap of faith.
- To be a successful stock market investor, you need to take a leap of faith.
Origin
Mid 19th century: translation of medieval Latin saltus fidei.