名词形式是undertaking，意思是事业，任务，例如：

1.He had no great hopes for the success of his undertaking.他对自己事业的成功不抱太大希望。

2.He lent his name to the undertaking.他以自己的名义支持该事业。

3.In those days, the trip across country was a dangerous undertaking.那个时期，越野旅行是一件危险的事情。