A/one false move phrase informal figurative
An action that has the potential to exacerbate an already dire situation.
Don't make a false move or I'll shoot!
She's in a difficult financial situation, and if she made a false move now, she could lose everything.
One false move and you're dead, he shouted at the bank clerk.
actions are more important than words
Used when there are too many people involved in a task, and this can lead to a failure or its likely outcome isn't good
Have barely enough time to do something; succeed in doing something by the thinnest of margins
Used to talk about a situation which begins to worsen
If someone has a cast iron stomach, they have a strong stomach that can digest unusual food and even bad food without being ill.
Jimmy must have a cast-iron stomach, when he drank milk with lime juice and felt perfectly fine afterward.