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to twist; to screw; to wrench
to sprain
「捩る」 has other readings with different meanings.
彼は体を捩って後ろを振り返った。
He twisted his body and looked back.
彼は固く閉まった瓶の蓋を力いっぱい捩った。
He twisted the tightly closed bottle cap with all his strength.
整備士がボルトをレンチで捩っている。
The mechanic is twisting the bolt with a wrench.