The act of frightening; fright or the condition of being frightened.
From 'fright' plus the abstract noun suffix '-ment,' which creates nouns describing actions, conditions, or results (like 'amazement' or 'government').
Words ending in '-ment' like 'frightment' are actually less common in modern English than they used to be—we'd now say 'fright' itself rather than 'frightment,' showing how language preferences shift over centuries.
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