This study utilized the written data from the "2017 Corpus of Contemporary Taiwanese Mandarin" to analyze the semantic features and cognitive concepts of máng "busy". There were a total of 1,094 instances analyzed, after removing the meanings bāngmáng "help", and other four-character idioms. For analysis, the study firstly analyzed the semantic features of máng and its different semantic profiles. The results showed that the semantic features of máng can be sorted into three types: (1) to describe someone taking a great effort and time to do something; (2) to describe someone seizing the time to finish something urgently; and (3) a dense condition given a specific period of time. Máng can be profiled according to these semantic features. Next, the complements following máng were analyzed for the cognitive concepts of máng. Three categories of cognitive concepts of máng were identified: the state of events, physical performances, and emotions. Together, the semantic features and the cognitive concepts of máng display its urgency, consumptiveness, and density. This study provides a detailed account of a frequently used word in Mandarin, a word so frequently used that we do not normally realize its different profiling of meanings.