2.VerbTo 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."
3.VerbTo take (something) in covertly; to smuggle.
"He had sneaked the alcohol in and was now handing it out to his friends."
4.VerbTo insert (words, ideas, etc.) into something without drawing attention to it.