Yellow silk's bride and grandson. What? What is the second half of this idiom?

This story comes from Shi Shuo Xin Yu. At that time, Cao Cao and Yang Xiu went to Cao E Monument and saw these eight words engraved on the back of the inscription. Cao Cao asked, "Do you know what it means?" Yang Xiu said he knew, so Cao Cao told him not to say anything and let him think for himself. Later, their carriage walked three miles, and Cao Cao thought of it. "Yellow silk" is colored silk, "silk color" is "absolutely", "young woman" is a girl, which together is "little girl" (wonderful), and grandson is her daughter's child, that is, "woman" (good), which means garlic mortar used for mashing garlic. That is, "accepting the heart" (in traditional words), together, Cao Cao, the "Miao Yan", waited 30 miles to remember it, so he joked that his talent was 30 miles behind.