adjective
having an obligation to do something, or having control over or care for someone, as part of one's job or role
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As the team leader, you are responsible for delegating tasks and ensuring they are completed on time.
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I'm responsible for feeding the cat while my roommate is out of town.
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Don't worry, I'll be responsible for bringing the snacks to the party.
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The CEO is ultimately responsible for steering the company in the right direction.