The idiom 推陈出新 is formed by conjoining the verb-object pair 推陈 (discard the old) with 出新 (produce the new), where 推 means "push" or "discard", 陈 means "the old", 出 means "bring out", and 新 means "the new"; these phrases are placed sequentially to create a causal relationship within a fixed four-character unit.