General Englishneutralinformal
- To appear or become visible suddenly or unexpectedly.
- To occur or be noticed without prior warning.
General Englishinformalcolloquial
- To make a brief or casual visit; to drop in for a short time.
General Englishneutralinformal
- To arise or occur unexpectedly, especially a problem, need, or opportunity.
General Englishtechnicalcomputing
- Of a window, dialog box, notification, or menu: to appear on a computer or device screen.