Suppose I found somewhere a pharase “the Blue Zones” and I don’t know what it means.
Should I say,
(a) What does “the Blue Zones” mean?
or
(b) What do “the Blue Zones” mean?
I assume (a) is right, but I’m not sure.
What does “the Blue Zones” mean? (There is only one phrase whose meaning you wish to know. ) What do "the Blue Zones" and "the Red Zones" mean?
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What does “the Blue Zones” mean? (There is only one phrase whose meaning you wish to know. The fact that the phrase contains a plural noun is irrelevant.)
What do "the Blue Zones" and "the Red Zones" mean? (There are two phrases you want to know the meaning of.)
Simple enough?
CJ