B1
to be the person whose duty is to deal with someone or something
Dictionary examples:
She's responsible for keeping the office quiet, but she snores during her naps! (0.0)
I'm responsible for organizing the company picnic. Hope everyone likes ants! (0.0)
I'm responsible for testing ice cream flavors. It's a tough job, but someone's got to do it! (0.0)
I'm responsible for looking after the children during the lunch break. (26.7)
Paul is directly responsible for the efficient running of the office. (40.3)