Definition: The phrase "bunch up" is a verb that means to gather together or cause things to come together in a group or cluster. Think of it as bringing things or people closer to each other.
In more complex writing or speaking, you might say: - "The crowd began to bunch up as the concert started, making it hard to move." - "During the meeting, the ideas tended to bunch up, making it difficult to identify the best solution."
"Bunch up" is a versatile verb that describes the action of gathering together closely. It can be used in various contexts, both physical and metaphorical.