Whatever do you mean by that?中的by是什么用法是不是类似catch sb.by his arm.能不能解释下这里by的用法

WHATEVER YOU WANNA DO it doesn't mean that you must always like the subject.it does mean,however,that you must bewilling to do whatever is necessary to learn what do you mean what do you mean? what do you mean what do you mean. Do you mean it? do you mean to What do you mean Whatever you do I will whatever you do等于什么 i will surport you whatever you do WHEREVER WILL YOU GO WHATEVER YOU DO wherever you go,whatever you do Whatever you do you have my what do you mean?翻译 What do you mean?是什么意思 do you really mean that