What is another word for is onto someone?
Pronunciation: [ɪz ˌɒntʊ sˈʌmwɒn] (IPA) 
When someone is onto someone else, they may have a sense of suspicion or awareness about their actions or intentions. Some synonyms for this phrase include being wise to someone, being hip to someone, or being onto their game. Other related phrases might include being onto someone's tricks or being onto someone's schemes. No matter the exact wording, all of these phrases suggest a level of insight into someone's behavior that can be useful for protecting oneself or gaining an advantage in a particular situation. In general, staying "onto someone" can be a savvy move in many different contexts.
