Take a flier is an idiom that means to take a RISK or chance. It is derived from the phrase 'take a flyer, ' which refers to taking a RISK in aviation. The crossword solutions for this term are JET (3 letters), RISK (4 letters), and VENTURE (7 letters). JET is a type of aircraft, RISK is a potential danger or harm, and VENTURE is an undertaking with an uncertain outcome. Together, these words suggest taking a RISK or chance in an uncertain situation.