plan

謨 is composed of 言(speech) and莫. 莫 depicts the lowering sun being covered by grass, light dims at sunset, everything become obscure which actual shape is difficult to be seen, 莫 has already had the meaning of roughness. On the other hand, saying is easier than doing, so謨 has the meaning of plan or project, since before being done, plan or project are still intangible speech.