'antiquize' originates from English, formed from the adjective 'antique' plus the verb-forming suffix '-ize' (from Greek/Latin via French), where 'antique' ultimately came from Latin 'antiquus' meaning 'old'.

'antiquus' (Latin) passed into Old French as 'antique' and Middle English as 'antique'; the modern English verb 'antiquize' was created by adding the productive suffix '-ize' to mean 'make antique'.

Initially the roots referred simply to 'old' or 'ancient'; over time the formed verb came to mean 'to make or give the appearance of being old' rather than denoting genuine age.