letter to the editor, n.All

The Letter to the editor (n.) cooled ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠anger in the writing: by the time the envelope was sealed, the agitation had passed.