Slip through is a phrase that means "to escape notice or avoid detection." There are many synonyms for this phrase, including slip away, slip past, sneak through, slip by, slip out, evade, elude, sidestep, dodge, circumvent, slip past unnoticed, slip away unseen, slip through the cracks, and slip out of sight. These words are all useful for describing situations where someone or something manages to avoid being noticed or detected. Whether you are talking about a thief slipping away from the scene of a crime or a student slipping through a test without being caught cheating, these synonyms offer a variety of ways to express a similar idea.