查询结果:

adj. 全面的,综合的
adv. 总的来说 
n. (pl.) (套头)工作服,工装裤

拆分: over-在上 + all全部 

例:
an overall plan 综合规划
to strengthen the overall capacity of our country 增强我国的综合国力
Overall I was disappointed. 总的来说,我很失望。