retrofit

Từ điển LongMan Dictionary

ret‧ro‧fit/ˈretrəʊfɪt $ -troʊ-/ verb (past tense and past participle retrofitted, present participle retrofitting) [TRANSITIVE]
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:
　 ▪ plans to retrofit oil boilers

—retrofit noun [COUNTABLE]

—retrofitting noun [UNCOUNTABLE]

verb
EXAMPLES FROM CORPUS
▪ Some manufacturers are already offering to retrofit old models with catalytic converters.
▪ The latest build is air-conditioned, and following the final deliveries Adtranz is to retrofit the earlier cars with full air-conditioning.