Danger or trouble arising from within one's own immediate circle or close proximity; an internal problem or threat that is very near.
团队内部的沟通不畅，逐渐演变成了“肘腋之忧”，影响了项目的顺利推进。
Poor internal communication within the team gradually turned into a "danger close at hand," affecting the smooth progress of the project.
Next Idiom