This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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verb-intransitive. To twist, as in pain, struggle, or embarrassment.

verb-intransitive. To move with a twisting or contorted motion.

verb-intransitive. To suffer acutely.

v. To cause to twist or squirm; contort.

n. The act or an instance of writhing; a contortion.

v. To twist, to wring (something).

v. To contort (a part of the body).

v. To twist or contort the body; to be distorted.

n. The number of negative crossings subtracted from the number of positive crossings in a knot

v. To twist; to turn; now, usually, to twist or turn so as to distort; to wring.

v. To wrest; to distort; to pervert.

v. To extort; to wring; to wrest.

verb-intransitive. To twist or contort the body; to be distorted. Also used figuratively.

To turn and twist about; twist out of shape or position; wrench; contort.

To wrest perversely; wrest; pervert.

To wrench; wring; extort.

To move or stir in a twisting or tortuous manner; twist about, as from pain, distress, or stimulation.

n. A contortion of form or features, as from pain or other emotion; an act of writhing.

n. The band of a fagot.

v. to move in a twisting or contorted motion, (especially when struggling)

"With a thin writhe of a smile, Collins investigated the insides of her clenched hands to make sure that the hooks were connected."

writhed    writhen    writhes    writhing    wrothe   

move   

wrench   

twist    turn    wring    wrest    distort    pervert    extort    worm    contort    wry   

Blyth    Fifth    Smith    Smyth    fifth    forthwith    frith    herewith    myth    pith   

twitch    heave    groan    thrash    wriggle    shiver    contort    lurch    whimper    twist