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We always called this guy the 'red herring', to throw off cops.

We call it a horse in Lithuanian, because it's always in front of the carriage.

And no, we don't use horses anymore.

We called them designated decoys where I grew up.

We call this guy "lightning rod". Interesting how we've all identified this actor with different but essentially synonymous terms.

My term for this is "minesweeper"