くれぐれも

please be sure to

→ 呉々
phrase Rare #38,818
please be sure to Adds strong emphasis to a request, warning, or expression of sincere regards. Often used in polite or formal language.
JA: くれぐれも無理をしないでください。
EN: Please be sure not to overdo it.

からもくれぐれもよろしくことです

My husband also sends his very best regards.

くれぐれも言葉に気をつけろ

Watch your words.

— ロード・オブ・ザ・リング/二つの塔 (2002)

くれぐれもここだけの話にしておいてくれよ

Whatever you do, keep this between us.