When someone chimes in with their opinion or adds their input to a conversation, they may use the phrase "puts one two cents in." However, this phrase has several synonyms that can be used interchangeably. Some other common expressions that mean the same thing include "throws in one's two cents," "gives their thoughts," "shares their perspective," "adds their voice," "provides their insight," and "contributes to the discussion." Each of these phrases can be used to describe the act of someone offering their opinion or idea in a discussion or conversation.