If someone is with-it, they follow what is new and fashionable — in clothes, music, ideas, technology — and it shows. 'His grandmother is surprisingly with-it: she's on TikTok.' Now the honest part. This is an old-fashioned way of saying 'fashionable', and that gives it a funny twist: today it is used mostly BY older people, or ABOUT older people, and often with a smile. A young person in 2026 will not say 'that jacket is very with-it'. So the word is a small trap — using it does not make you sound modern; it makes you sound like someone's uncle trying to sound modern. That is fine if you want the joke. There is a second, different meaning that is still fully alive: 'with it' meaning awake, alert, thinking clearly. 'Sorry, I'm not really with it this morning — I only slept three hours.' 'Grandad's ninety-two and still completely with it.' In this sense it usually has no hyphen and comes after the verb. That is the pattern to remember: hyphen and before a noun tends to be the fashionable sense (a with-it young manager); no hyphen and after the verb is usually the alert sense — though the fashionable one also appears after the verb, so context decides.

趕流行的、跟得上時代的（現在聽起來有點過時，長輩在用的說法）。另一個還很活的意思是「頭腦清醒、狀況內」——像 I'm not with it today 就是「我今天很不在狀況」。