throw away, discard
甩 centers on forcefully getting rid of something: throwing away or discarding an unwanted item.
甩 is a relatively modern character, likely formed by adding a vertical stroke to 用 to suggest the action of throwing something away. The exact historical development is uncertain.
Imagine 用 (use) with a long vertical stroke dropping down like something being thrown away: once used, it is discarded.
For シュツ, picture throwing away a pair of old shoes: shoes -> シュツ, and you discard them with a swift motion.
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