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Verb: sneak in
  1. Enter surreptitiously
    "He sneaked in under cover of darkness";
    - creep in
  2. Put in casually or without drawing attention
    "She sneaked in a reference to her own work";
    - slip in, stick in, insert

Derived forms: sneaks in, sneaked in, sneaking in

Type of: add, append, penetrate, perforate, supply