†by covert: under cover, covertly. †in (into) covert: in concealment; in hiding, or disguise, secretly; rarely, in safety. in (the) covert of: in…

In concealment or retirement. Obsolete. rare.

†in cover: in concealment (obsolete). under cover: under a screening or sheltering eminence, roof, etc. under (the) cover of: under the…

In a hidden manner; so as not to be evident to the sight or understanding; secretly.

In a concealed manner, covertly.

In proverbial, figurative, or allusive uses. in(to) smoke (slang, chiefly Australian), in(to) hiding.