Learn in the textbookTouch Gestures, Windows, and Icons
DefinitionA pinch (ピンチ) is a touch gesture that enlarges or shrinks the display by changing the gap between two fingers on the screen.
ExplanationSpreading the fingers apart to zoom in is called a pinch-out (ピンチアウト), and bringing them together as if pinching to zoom out is called a pinch-in (ピンチイン). Because it uses two fingers at once, it works on screens that support multi-touch (マルチタッチ), a method that lets you operate by touching with several fingers simultaneously.
AnalogyIt resembles stretching a rubber sheet with two fingers: the pattern looks larger, and when you bring the fingers together it looks smaller.
Memory hook"Pinch" means to squeeze between the fingers. Pinch in and the view shrinks; open out and it grows.