ichidan verb, transitive verb
remonstrate; admonish; warn against
Used when someone, often a subordinate or close person, respectfully points out a fault or advises against a course of action. Carries a nuance of sincere, sometimes earnest, counsel.
彼は上司の無理な計画を諫めた。
He remonstrated with his boss about the unreasonable plan.
母は私
My mother admonished me not to stay up late.
友人が危険な投資を諫めてくれた。
My friend warned me against the risky investment.