The phrase "lays up on" typically refers to something being stored or accumulated over time. Some alternative ways to express this concept include "stockpiling," "hoarding," "amassing," "accumulating," "stocking," "stashing," and "saving up." Each of these synonyms conveys a similar idea to "lays up on," but with slightly different connotations or implications. For example, "hoarding" implies a more excessive or compulsive accumulation, while "stockpiling" suggests preparation for future use or need. Choosing the right synonym for "lays up on" depends on the specific context and desired tone of the message being conveyed.