Wiktionary
conj. At the same time as, usually over an extended period.
Usage examples of "all the while".
Medics dowsed the two with fresh water, plucked away the leeches, cut away their garments, all the while injecting them with painkillers and drying them off with crumpled veils of gauze and a hot air blower.
He pumped her arm as if he expected her to spout water out of her mouth, and all the while he enthused about thoroughbred racing.
Ronsard, who smiled and flattered her, all the while with that look of amusement still in his eyes.
That thought hovered in the back of her mind all the while she worked with the sandals, using glue from her tool kit to attach the pearls to the straps.
For all her obviousness, she was no fool, after a few minutes she switched her flirtatious ness to Ron sard, who smiled and flattered her, all the while with that look of amusement still in his eyes.