to trip and fall; to take a tumble; to suffer a setback or failure

(variant form) to trip and fall down; to suffer a setback or defeat in one's life or work

to perform a somersault or flip; to tumble; to take a fall or fail in an endeavor

(variant form) to perform a somersault or tumble; a fall or trip

(variant form) the physiological connection of muscles and joints; the critical structure or internal logic of a thing; the knack or secret to doing something well