Wiktionary
adv. repeatedly wavering. Not straightly
Usage examples of "from side to side".
For the length of the human body, from the crown of the head to the sole of the foot, is six times its breadth from side to side, and ten times its depth or thickness, measuring from back to front: that is to say, if you measure a man as he lies on his back or on his face, he is six times as long from head to foot as he is broad from side to side, and ten tittles as long as he is high from the ground.
His mouth came open and he waggled his lower jaw from side to side in a wry laugh.
Although looking him straight in the face, she did not seem to notice, any more than she appeared to notice Narishma's hands on his sword when she put a finger under his chin, moving his head from side to side before he could jerk back.
She studied herself in the mirror, turning her face from side to side.