The act of making quick thrusts with a sword or foil.
Present participle of 'foin,' using the standard English '-ing' suffix to create the gerund or continuous form of the verb.
The word 'foining' appears in historical fencing manuals as a technical term, and it's one of those beautifully specific action-words that was created because fencers needed precision language to describe exactly what their blade was doing.
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