on the sly in French
on the sly in French
en cachette
(idiomatic) Slyly, in an inconspicuous manner, so as not to be seen; secretly; stealthily.
en douce
(idiomatic) Slyly, in an inconspicuous manner, so as not to be seen; secretly; stealthily.
à la dérobée
(idiomatic) Slyly, in an inconspicuous manner, so as not to be seen; secretly; stealthily.
à la sauvette
(idiomatic) Slyly, in an inconspicuous manner, so as not to be seen; secretly; stealthily.