bottom-up
adjective uk/ˌbɒt.əmˈʌp/ us/ˌbɑː.t̬əmˈʌp/
（计划、组织等）由细节到总体的方式的
considering the smaller or less important parts or details of a plan, organization, etc. first
a bottom-up approach to building a successful company 用由支到干的方法打造一个成功的公司
Opposite: top-down