The idiom "someone means business" means that the person is taking something seriously and plans to do something about it. You can use it in sports: The Giants are entering the stadium now and it's clear they mean business -- They will play hard and will take the game seriously in their attempt to win. You can even say "Mom is heading this way and she looks like she means business" to show that your mother looks a bit angry about something and is not coming over to give you a candy bar.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.