独当一面

dúdāng-yīmiàn

[take charge of a department or locality; be able to undertake the tack alone; work on one's own; take charge as chief] 单独承当一方面的工作或使命

他喜欢老老实实做事, 苦一点也不要紧, 却怕独当一面, 要自做主张