The saying "two's company, three's a crowd" implies that having a third person around can interfere with the intimacy or dynamics of a relationship. Synonyms for this phrase include "the more, the merrier" which suggests that having more people can add to the fun and excitement. Another phrase is "the odd one out" which highlights the feeling of not fitting in when there are three people and the dynamic becomes unbalanced. "Triangulation" is another similar term and refers to the phenomenon of communication breakdowns that occur when there is a third party involved in a conversation or relationship. Ultimately, the context and personality of the individuals involved will determine whether three's a crowd or not.