(~s)
1.
An ~ of an idea, theory, or plan is a person who supports and explains it, and who tries to persuade other people that it is a good idea. (FORMAL)
...a leading ~ of test-tube baby techniques.
= advocate
N-COUNT: usu N of n
2.
An ~ of a particular skill or activity is a person who is good at it.
...the great ~ of expressionist dance, Kurt Jooss.
N-COUNT: with supp