When someone missteers, they make a mistake in the direction they are going or the action they are taking.
Missteering is usually not good because it means someone is doing something wrong or making a mistake.
Examples:
She missteers and goes the wrong way.
He missteers and spills his drink.
I missteer and drop my toy.
The cat missteers and falls off the table.
He missteers and knocks over all the blocks.
The bird missteers and flies into the window.