The phrase "to take on" means to assume responsibility for something, often in a challenging or difficult context. It can refer to accepting an obligation, duty, role, or task that may be risky or demanding. For example, one might say they are taking on a new job, which implies that they will be assuming the responsibilities and expectations associated with that position. The phrase is also used more broadly to describe someone's willingness to confront or deal with something, such as an issue or problem. In this sense, "to take on" can imply taking action or tackling a situation head-on.