To make a big mistake, especially when it is careless or stupid.
to blunder in preparing a medical prescription
Inherited from Middle English blundren, blondren (verb) and blunder, blonder (“disturbance, strife”), from the verb; partly from Middle English blondren, a frequentative form of Middle English blonden...
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To move in an unsteady way.
I was never distinguished for address, and have often even blundered in making my bow.
To enter a place or become involved in a difficult situation by mistake.
He and I had blundered into the middle of a gang fight once and I saw him shank a guy-stuck homeboy in the chest and strolled off cool as you please.