To concentrate one's attention and focus completely on something.
会集中。原指君臣协力，集思广益◇形容精神高度集中。
汉·王褒《圣主得贤臣颂》聚精会神，相得益（章）彰。”
She was so engrossed in the book that she didn't hear me calling.
Learn the next connected idiom: 聚精会神 (jù jīng huì shén) → 神采奕奕 (shén cǎi yì yì)
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