The term "enter into" refers to the act of starting or engaging in something, such as a conversation, contract, or agreement. Antonyms for "enter into" include "exit from," "disengage from," "withdraw," "discontinue," and "terminate." These antonyms suggest the opposite action of starting or continuing something, and instead involve stopping or ceasing something that has already begun. For instance, if you "exit from" a conversation, you are disengaging from it, whereas if you "enter into" a conversation, you are engaging in it. Similarly, if you "withdraw" from a contract or agreement, you are disengaging from it, whereas if you "enter into" a contract or agreement, you are starting it.