普通
pǔtōng · HSK 2
ordinary
普 = universal/widespread + 通 = through; what passes everywhere is ordinary
普 carries the sense of widespread or general (as in 普遍), and 通 means to go through or be connected. Together: something that passes through everywhere = common, average, ordinary.
通 — 辵 (辶) walk + 甬 yǒng (phonetic)
通 is a semantic-phonetic compound. The 辶 (chuò) component means 'walk' or 'movement', giving the meaning of going through or passing. 甬 (yǒng), originally depicting a hanging bell or a path, supplies the sound. Together they convey 'to pass through, communicate, connect'.