to move, to shake
扽 centers on causing something to move or shake, often by a direct physical action. The two given meanings are closely related: to move something and to shake it.
扽 combines 扌 (hand) with 屯, which likely contributes a phonetic element. The exact historical development is uncertain, but the structure suggests a hand action related to moving or shaking.
The hand radical 扌 beside 屯 suggests using your hand to give something a push or a shake. Imagine grabbing an object and shaking it to move it.
For トン, picture a ton of bricks being shaken by a giant hand: ton -> トン, and the hand moves the heavy load.