move
扤 centers on movement, specifically the act of moving or shaking something. It is a rare kanji with a narrow meaning.
扤 combines the hand radical 扌 with 兀, which may have contributed a phonetic element. The exact historical development is uncertain.
The hand radical 扌 suggests an action done by hand. The right side 兀 looks like a simple, sturdy base. Imagine using your hand to shake or move a heavy, blocky object.
For ゴツ, picture a hand moving a heavy, blocky stone with a rough, grating sound: 'gotsu, gotsu'. The sound 'gotsu' cues ゴツ.