sneak in

verb4

1. •
   To enter without being noticed.

   • I'm going to try to sneak in by the back door.
2. •
   To take (something) in covertly; to smuggle.

   • He had sneaked the alcohol in and was now handing it out to his friends.
3. •
   To insert (words, ideas, etc.) into something without drawing attention to it.

   • His ideas got snuck in to the final draft.
4. •
   To barely advance or be allowed entry in a competition or organization despite minimal credentials or competitors thought to be superior.

   • With Newport's team suffering from injuries, Springfield was able to sneak in to the quarter-finals.
   • Despite a mediocre grade in English, Pat just managed to sneak in to the university.