Wiktionary
slow out
vb. (context animation English) To adjust the spacing of inbetween frames so as to smoothly accelerate movement of an object as it leaves a resting position
Usage examples of "slow out".
His body flopped once and his brains leaked onto the carpet slow out the hole in the back of his head.
He maneuvered the boat around, took her at slow out of the marina.
Cathy was so slow out that Melinda gained a metre on her in the first 20m.
Like the slow out-fanning of a lifting wing, the direction of my thoughts turned skyward.
Before, the Confederates had kept white settlement slow out of deference to the Five Civilized Tribes of Indians, who'd helped so much in the War of Secession.