Sorry, do not understand the title, why?
what is the meaning of "has yet to follow suit " and how to use "yet"
He has yet to follow suit. = He has not yet done the same, or reacted in a similar manner.
Probably a reference to cards, probably bridge, where one person plays a card and another must play a card of the same suit. That is to follow on in a compatible manner.
Here "yet" means not done up until now.
Have I answered your question yet?
Is the question yet answered?
Is it lunchtime yet? I hope it comes soon. I'm famished.
Are they not engagged yet? They've been dating for months.