The phrase "two-two" generally means "in twos" or "two at a time." If you're looking for synonyms for this phrase, there are several that can be used interchangeably. For example, you could say "in pairs," "two by two," or "double." Other synonyms include "duo," "couple," "twosome," and "dyad." All of these words convey the same idea: that there are two of something, or that things are happening in twos. So whether you're talking about a pair of shoes, a couple of people, or a twosome playing tennis, there are plenty of ways to describe the concept of "two-two".