Phonosemantic compound. 木 represents the meaning and 莫 represents the sound.

Original meaning: flesh under the chin of a cow

Phonosemantic compound. ⺼ represents the meaning and 古 represents the sound. Based on the original meaning "flesh under the chin of a cow", which later shifted to "beard" (now written as 鬍 in traditional characters). Also used pejoratively to refer to foreigners from central Asia, who tended to have more beards than Han Chinese people. This meaning also shifted to "reckless" and "outrageous".