Yéye mósuō zhe nà kuài lǎo yùpèi, shěbude fàngxià.
Grandpa kept fondling that old jade pendant, unable to put it down.
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挲 is not used independently in modern Chinese. It survives almost only in 摩挲 (to stroke / caress), which also has a colloquial reading māsa. The variant form 挱 is listed for the same word.