on the Q.T.

慣用表現

(idiomatic) Quietly; in a secretive manner; clandestinely.

日本語の意味

こっそりと / ひそかに / 秘密裏に

They moved the funds on the Q.T. to avoid drawing attention.

注目を集めないように、その資金をこっそり移動させた。

意味（1）

(idiomatic) Quietly; in a secretive manner; clandestinely.

Will you be so kind as to impress him with the fact that this expedition is on the Q.T.? Not that I think he will say anythin'.