crop up
To suddenly occur or become noticeable. I knew my fears would crop up before I could actually jump from the plane. Problems always seem to crop up when we're about to go away on vacation.
crop up
to appear without warning; to happen suddenly; [for something] to begin to reveal itself in the open. Some new problems cropped up at the last minute.
crop up
Appear unexpectedly or occasionally, as in One theory that crops up periodically is the influence of sunspots on stock prices, or We hope new talent will crop up in the next freshman class. [Mid-1800s]
crop up
v. To happen or appear, often unexpectedly: Errors have cropped up in the report despite all our proofreading.