on the sly

US /ɑn ðə slaɪ/
UK /ɑn ðə slaɪ/
"on the sly" picture
1.

gizlice, çaktırmadan, el altından

doing something secretly or furtively

:
•
He was eating cookies on the sly when his mom wasn't looking.
Annesi bakmazken gizlice kurabiye yiyordu.
•
They were meeting on the sly to plan the surprise party.
Sürpriz partiyi planlamak için gizlice buluşuyorlardı.
:
sly