一言忠告

a word of advice

→ 一言
phrase Rare #33,464
a word of advice Used when giving a brief piece of advice or warning. 一言 literally means “one word,” emphasizing that the advice will be short.
JA: 出発する前に、一言忠告しておきたい。
EN: I want to give you one word of advice before you leave.

一言忠告をします

Let me offer you a word of advice.

一言忠告しておきたいんだ

I just want to give you a word of advice.

彼に一言忠告してあげなさい

Give him a word of advice.

彼は彼女に一言忠告を与えた

He gave her a word of advice.

あなたに一言忠告したい

I have one piece of advice for you.