›to increase in size, number, or importance, or to make something increase in this way: expand into sthThese companies need to expand into new markets because they have reached market saturation at home.expand rapidly/greatly/significantlyexpand the range/scope/capacitySupermarkets continue to expand the range of products and services offered in their outlets.expand a business/company/programmeProduction capacity could expand by up to 30%, thus bringing down prices.