нареч. secretly, in secret, surreptitiously, by stealth
on the quiet, on the sly разг. тайком от кого-л. – without smb.'s knowledge
behind smb.'s back (в плохом смысле) уйти тайком – to steal away/out
нареч. secretly, surreptitiously
on the quiet разг.
уйти ~ steal* away
~ от кого-л. without telling smb