You will often hear the everyday English phrase 'The buck stops here' at the workplace. Of course, it could be used in other contexts too.
The everyday English expression 'The buck stops here' basically means that the person or persons to whom it is being addressed is responsible for a specific action. It also implies that a final decision has been arrived at regarding that action.
1. The Principal called all the class monitors to his office and told them, "There is an important teachers meeting today so you will be responsible for maintaining discipline in the classrooms. The buck stops here till the teachers return"
2. At the monthly review meeting, the Boss told all the senior sales managers "The company is showing low profits. Everybody needs to improve their sales targets for which you need to thoroughly train the recruits under you. The buck stops here and next month I want to see positive results."
3. Shriram's father got angry with his carelessness, saying "You are the one who started it and not your cousin. He cannot be blamed. The buck stops right here"