misstrike

To strike badly or incorrectly.

To the musician oft a mis-struck note Suggests a brighter strain of harmony;

[…] scrupulous attention had to be paid to the reality of the here and now lest liberalism misstrike the balance between the desire for freedom and the desire for equality […]

An instance of striking something badly or incorrectly, a misstroke

Many anglers use a Salmon-gaff for handling Pike. They are splendid things in a boat where only two men who know how to use them are fishing. In the hands of many ordinary men you lose more fish by mis-strikes than you can catch with them.

Stony-faced Zacharias Jones drummed his fingers on his desk top lost in a trance of invisible notes, chords. […] So vividly did he hear the notes in his head, he always heard a misstrike. When he made a mistake, he was obliged to return to the very beginning of the exercise and start over.

A coin or medal with an irregularity, defect or error.

How much should an odd or unusual coin vary from the ordinary run to merit recognition as a misstrike or genuine accidental variety? […] Although die breaks are not considered by many as true oddities, other collectors are inclined to include them as freaks or errors belonging to the misstrike family.