普通
ふつう · futsuu · JLPT N4 · na-adj
usual
普通 = widespread (普) + pass through (通): what gets through everywhere
普 means widespread or universal, 通 means to pass through or be in circulation. Something that circulates everywhere is common, usual, ordinary. Sound hook: futsuu is the foot-soo everyday answer, as in futsuu desu = it is just normal.
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'.