expression, adverb
with intense concentration; eagerly; intently
Describes staring, watching, or focusing on something with such intensity that it seems as if one's eyes are devouring it. Often used with verbs like 見る or 見つめる.
彼は食い入るように画面を見つめていた。
He was staring at the screen with intense concentration.
子供たちは食い入るように絵本を見ていた。
The children were eagerly looking at the picture book.