"enter a discussion" is a correct and usable phrase in written English.
You can use it when you are introducing someone to a conversation, or when you are asking someone to join in a conversation. For example, "Let's enter a discussion about our next project."
I said that I didn't want to enter a discussion, I would make a statement, and I said: 'I've spoken to several of the people whose lives you have seriously affected.
Standing in the foyer of an MIT lecture theatre, waiting to enter a discussion about how to survive internet fame, he was approached by two girls who held out their clenched hands towards him.
This is not the place to enter a discussion about the merits and drawbacks of various versions of Free Logics.
Lena Dunham (of the hit HBO series, "Girls") and loyal campaigner for Hillary -- has spoken out about the adjectives routinely applied to her that would never enter a discussion of a male candidate - that she is "shrill", "frumpy", "fake", etc.
Enter a discussion about the impact of the modern Street Art movement and someone will inveigh with swollen gravitas that Street Art has the power to "activate" or "re-vitalize" a previously moribund space, to bring it to life.
In comment 13, Hans and Mark entered a discussion of Mark's proposed proof that the out-in strategy solves all solvable states on the P 12, 5) graph.
Over a defined period of time — a few weeks or a month — before entering a discussion or meeting, ask yourself, "What do I want from this situation?" Then, afterwards, evaluate the results: "Did I get what I wanted?" This will create a track record of your success and indicate whether you need to adjust your style.
Is this a result of the "Lustig effect"—when you have an expert source entering a discussion with rhetoric so loud and extreme it drowns out any other perspective?
