godan verb (-su)
leave food uneaten; not finish one's meal
Used when someone does not eat all the food served or prepared, leaving some behind.
彼はいつもご飯を食い残す。
He always leaves some of his rice uneaten.
好き嫌いが多くて、野菜を食い残してしまった
I'm a picky eater and ended up leaving the vegetables.