Definition of "sneak in"

sneak in

verb
third-person singular simple present sneaks in, present participle sneaking in, simple past and past participle sneaked in or (informal, chiefly US) snuck in
1. To enter without being noticed.
  Quotations
  Welsh nerves continued to jangle as Blake let a long ball bounce over his head and only Wayne Hennessey's swift advance from his line prevented Mirko Vucinic sneaking in.
  2011 September 2, “Wales 2-1 Montenegro”, in BBC‎
2. To barely advance or be allowed entry in a competition or organization despite minimal credentials or competitors thought to be superior.
3. To take (something) in covertly, to smuggle.