Creep by can refer to something that slowly passes by or to the passage of time that seems to move slowly. It can also indicate sneaking by quietly and unnoticed. There are many synonyms for creep by depending on the context. For example, "trickle by," "drag on," "slip by," "crawl by," "saunter past," "linger on" and "pass at a snail's pace" are all synonyms that describe time moving slowly. On the other hand, "slink by," "stealthily pass," "slip past unnoticed," and "sneak by" describe an action of moving quietly and unnoticed. These synonyms can add variety and depth to writing, helping to evoke a specific emotion or atmosphere.