brush up to

Brush up to means: To flatter or suck up to someone.. The word is mostly archaic or historical; you will only encounter it in old texts, period drama, or school history rather than current teen conversation. There is no real cause for parental concern; it is descriptive vocabulary rather than risky behaviour. If your teen uses it, context will usually make the intent clear. A short, curious question about where they heard it is usually all that is needed to know whether to follow up.

brush up to means: To flatter or suck up to someone.. Register: archaic, historical. Almost never used today; you will find it only in older texts, dictionaries of dialect, or historical writing. Avoid in active vocabulary. A common learner mistake is using the word in a register it does not fit, or assuming a single global meaning; native speakers immediately notice when slang appears in formal contexts, so always check the surrounding register before producing it yourself.