To put surreptitiously or improperly: const. in, on, under, out of. Obsolete.

To place, move, or convey stealthily. Now somewhat rare. †to steal on: to put on (one's clothes, etc.) hastily, so as not to be observed (obsolete)…

transferred. To convey, etc., in a stealthy or clandestine manner. Const. with adverbs and prepositions, as away, in, into, off, out of, through, etc.

To convey furtively or quietly.