Definition
To assume the responsibility of doing something without being asked or required to do so.
主動承擔做某事的責任，未經請求。
She took it upon herself to organize the event, even though no one had asked her to.
她主動承擔了組織活動的責任，儘管沒有人要求她這麼做。
He took it upon himself to clean the office, much to everyone's surprise.
他主動打掃辦公室，讓大家都很驚訝。
When the manager was away, she took it upon herself to manage the team.
經理不在時，她主動承擔了管理團隊的責任。