bluestblue wrote:So "as appropriate" is a phrase?
I am surprised that you do not know what a phrase is.
A phrase is a brief expression, sometimes a single word, but usually two or more words forming an expression by themselves, or being a portion of a sentence, so, yes, "as appropriate" is a phrase.
An instruction to a builder might read "Inspect brickwork, renewing mortar as appropriate". In this case, "as appropriate" means "
where appropriate", i.e. in those places where the mortar is substandard in some way, for example where it is crumbly or absent altogether.