The phrase "gets upon" can have different meanings depending on the context. It could mean to irritate or upset someone, or to climb on top of something. Some synonyms for "gets upon" that could convey the same idea of irritating or upsetting someone include: annoys, bugs, provokes, exasperates, irks, and agitates. On the other hand, if "gets upon" means climbing on top of something, then some synonyms could be: ascends, mounts, scales, climbs, or clambers. It's always important to choose the appropriate synonym depending on the context to ensure effective communication.