One False Move and I’ll Shoot

What is a false move? Is it the opposite of a “true move?”

My wife and I are watching an old 1954 movie called “The Snow Creature” on YouTube. Sometimes I like watching silly old time black and white science fiction movies. This one is also under the genre of “horror.”

At about 35 minutes and 40 seconds into it one of the men says, “One false move and I’ll shoot.”

So my wife asks the obvious question: What is a false move? Is it the opposite of a “true move?” Sometimes you hear this phrase in old Hollywood movies, but think about it… does it have any meaning? Would anyone ever really say it? If someone said that to you while having you at gunpoint, what would you be careful not to do? For sure, don’t do a “false move!” Only do “true moves,” I guess!