on the quiet, on the sly, without saying a word
Дети втихомолку съели все конфеты.
The children secretly ate all the candy.
Она втихомолку ушла с вечеринки раньше всех.
She quietly left the party before anyone else.
Он втихомолку взял деньги из ящика.
He took the money from the drawer on the sly.
WiktionaryPONSbab.laReverso