One false step, a stumble, would have sent us whirling into space.
Through a false step he came between a slowly moving train and tho high freight platform, and was rolled along for several feet.
Fer a time he haW succeed ed in cowing them, but a single false step must destroy him.
One false step and they would sink beneath the ice to die miserably.
British Dictionary definitions for false step
false step
noun
1.
an unwise action
2.
a stumble; slip
Idioms and Phrases with false step
false step
A stumble or blunder, as in Making a down payment without securing a mortgage was clearly a false step. This term transfers physical stumbling or tripping to other enterprises. [ c. 1700 ]