Edge in is a phrase that can be used to describe a situation where someone or something is on the brink of something. The two crossword solutions for this term are INFILTRATE (10 letters) and INSINUATE (9 letters). INFILTRATE means to enter or penetrate an area or organization secretly and subtly, often with the intention of gathering information or gaining access. INSINUATE, on the other hand, means to suggest or imply something without being explicit. Both words can be used to describe a situation where someone is trying to gain access to something without being noticed.