往返 (wǎng fǎn)
to go back and forth; to go to and fro; to do a round trip
Character breakdown
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往 (wǎng) · 8 strokes
Phonosemantic compound. 彳 and 止 represent the meaning, and 王 represents the sound.
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返 (fǎn) · 7 strokes
To walk 辶 backwards 反; 反 also provides the pronunciation