One of the uses of the press and hold gesture is to activate a mode enabling you to move an item with one finger to a new location.

Press And Hold

An interaction technique involving pressing and holding down a button or screen area for a specified duration to invoke a secondary action.

Gesture

A physical movement of a part of the body, especially a hand or the head, to express an idea or meaning.

Activate

To turn on or start a program, feature, or device, making it ready for use.