expression, godan verb (-u)
advise strongly; insist on
Used when someone strongly urges or insists that something be done, often with a nuance of pushing one's opinion. The phrase literally means 'to say do (it)', and it can imply a forceful or persistent recommendation.
See also: しろと言う
彼は私にすぐ出発せよと言った。
He strongly advised me to leave immediately.
My boss insists that we work overtime, but I'm against it.