Instead, it's a sudden and violent contraction of the person's muscles as a result of the electrical charge flowing through the body.

His countenance exhibited that violent contraction of the features which I have often remarked when his mind was disturbed.

Actually, it was not a shrug but a quick, violent contraction of his hard, globular abdomen.

He felt her come again, the violent contraction of her muscles fisting over him like glory.

They again returned that evening to find Toft again displaying violent contractions.

It is also possible to release stored energy suddenly, resulting in a violent reflex contraction of the back muscles.

I felt very weak, and my stomach muscles would make their violent contractions at times and places of their own choosing.

The violent, shaking contractions had appeared in the first Gemini flight and had continued through the tenth.

She lay back on the bed, and as her head sank into the soft pillow she felt a violent contraction, followed moments later by another.

A violent contraction raises her to a crouch, spilling the ponytail across her shoulder.