mistake,
error,
fault a wrong action attributable to bad judgment or ignorance or inattention; "he made a bad mistake"; "she was quick to point out my errors"; "I could understand his English in spite of his grammatical faults"
bobble the momentary juggling of a batted or thrown baseball; "the second baseman made a bobble but still had time to throw the runner out"
snafu an acronym often used by soldiers in World War II: situation normal all fucked up
spectacle a blunder that makes you look ridiculous; used in the phrase `make a spectacle of' yourself
bull a serious and ludicrous blunder; "he made a bad bull of the assignment"