sneak_in
1. [ verb ] enter surreptitiously
Synonyms: creep_in
Examples:

"He sneaked in under cover of darkness" "In this essay, the author's personal feelings creep in"

Related terms: penetrate
2. [ verb ] insert casually
Synonyms: stick_in slip_in insert
Examples:

"She slipped in a reference to her own work"

Related terms: add spatchcock
Similar spelling:   sneaking
  sneakingly
  sneakiness
  sneezing