Depicts of a hand or paw with fingernails or claws. The current meaning is a phonetic loan. In simplified Chinese 丑 is also used to mean "ugly", while in traditional Chinese this meaning is written with a separate character 醜.
Character Evolution
Oracle Bone~1250-1000 BCOracle Bone~1250-1000 BCBronzeEarly Western Zhou~1000 BCBronzeEarly Western Zhou~1000 BCBronzeEarly Western Zhou~1000 BCBronzeEarly Western Zhou~1000 BCBronzeMid Western Zhou~900 BCBronzeSpring and Autumn771-476 BCBronzeSpring and Autumn771-476 BCBronzeEarly Spring and Autumn~700 BCSealWarring States (Chu)475-221 BCSealXin9-23 ADSealShuowen~100 ADClericalSpring and Autumn771-476 BCClericalQin221-206 BCClericalWestern Han202 BC-9 ADClericalWestern Han202 BC-9 ADClericalEastern Han25-220 ADClericalEastern Han25-220 ADRegularModern