get hold of idiom (US also get ahold of)
B2 informal找到（某人）；得到
to find someone or obtain something
Where can I get hold of some stamps? 我在哪儿能找到些邮票？
How can I get ahold of Chris? 我如何才能找到克里斯？
mainly UK理解
to understand something
This is a very difficult concept to get hold of. 这是一个很难理解的概念。