enter into
phr. v..phr. v.. to officially start a formal agreement, a discussion, or a new period of time.
phr. v.. to formally begin or commit to a process, agreement, or relationship; often used in legal, political, or academic contexts.
The two countries decided to enter into a trade agreement.
Before you enter into a contract, you should always have a lawyer look at the details.
The government refused to enter into negotiations until all hostages were released and a ceasefire was established.
usually followed by an abstract noun like 'agreement', 'contract', 'discussion', or 'details'.
contrast with the plain verb 'enter' (physical movement); 'enter into' is for abstract commitments and is much more formal.
He entered into the room.He entered the room.use 'enter' without 'into' for physical locations; 'enter into' is for abstract things like agreements.