noun, noun or participle which takes 'suru', transitive verb
Rare word for threatening or intimidating someone, often verbally. The more common term is 威嚇 (いかく). This word may be encountered in older texts or as a variant.
彼は相手をいかつするような口調で話した。
He spoke in a tone that threatened the other party.
その
The letter was filled with threatening words.