What is "to keep shady"

Shady \Shad"y\, a. [Compar. Shadier; superl. Shadiest.]

1. Abounding in shade or shades; overspread with shade; causing shade.

   The shady trees cover him with their shadow.
   --Job. xl. 2

2. And Amaryllis fills the shady groves.
   --Dryden.

   2. Sheltered from the glare of light or sultry heat.

   Cast it also that you may have rooms shady for summer and warm for winter.
   --Bacon.

3. Of or pertaining to shade or darkness; hence, unfit to be seen or known; of questionable character; unsavory; equivocal; dubious, corrupt, or criminal; as, a shady character; -- of people or activities. [Colloq.] ``A shady business.''
   --London Sat. Rev.

   Shady characters, disreputable, criminal.
   --London Spectator.

   On the shady side of, on the thither side of; as, on the shady side of fifty; that is, more than fifty. [Colloq.]

   To keep shady, to stay in concealment; also, to be reticent. [Slang]