It means that an unauthorized person has gotten the login and password to access to your credit card, bank account, or other private site. Usually it means that they have done mischief, but not necessarily. The potential is there.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
Happy studentMy credit card has been compromisedYou have to cancel your account immediately before someone else uses your credit card information to buy lots of stuff.