Mao Collection, Upper Volume Radical: Heart (xīn) Mu Kangxi strokes: 15 Page 398, Entry 31 Tang Rhyme (Tangyun), Collected Rhymes (Jiyun), Rhyme Compilation (Yunhui), and Correct Rhymes (Zhengyun): Pronounced mu. Erya (Erya): Explaining Teachings (Shixun): Mu-mu means to exert effort. Also in Collected Rhymes (Jiyun): Pronounced mo. The meaning is the same.