ret·ro·fit /ˈretrəʊfɪt $ -troʊ-/ verb (retrofitted, retrofitting) [transitiveT] to improve a machine, piece of equipment, building etc by putting new and better parts in it after it has been used for some time 〔给机器、设备〕安装〔新部件〕;对…进行翻新改良 plans to retrofit oil boilers 翻新改进燃油锅炉的计划
—retrofit noun [countableC]
—retrofitting noun [uncountableU]