The phrase "cutting one in" is often used to describe jumping into a conversation or interrupting someone. However, there are many antonyms for this phrase that describe how to politely join a conversation. Some antonyms for "cutting one in" might include waiting for an appropriate pause in the conversation before adding your opinion or politely asking to be included in the discussion. Other phrases that could be used as antonyms might include "letting others speak," "showing respect for the speaker," or "waiting your turn to talk." Ultimately, choosing a polite approach to joining a conversation can make all the difference in how you are perceived by others.