kindest regards

idiomatic plural plural-only

(idiomatic) Used as a polite closing of a letter

Japanese Meaning

手紙の結び文句として使われる、丁寧な別れの挨拶

She signed the letter with kindest regards, hoping her gentle words would soothe the recipient's worries.

彼女は優しい言葉が受取人の不安を和らげることを願って、心からの敬意を込めて手紙に署名した。

Sense（1）

(idiomatic) Used as a polite closing of a letter