On the wall of a fast-food restaurant is a sign that reads:
"Give up, give in or give everything" KFC-documentary (see 31:20-31:24)
I know the meaning of "give up", "give in" and "give", but it does not make sense to me when I combine the 3 commands. It seems to mean something like "STOP (doing something)", "yield(or agree)" or "give away".
I thought maybe it is not for customers but it is only for the staff, but it does not make sense for them either. Why should they stop, yield, and give everything?
What does it mean?