piān​tǎn

favor

偏袒 piān​tǎn
favor verb
to side with or discriminate in favor of one party

As a referee, he should not favor either side.

bare shoulder verb
to bare one shoulder, historically used as a gesture of respect or submission

Legend has it that ancients would bare their right shoulder when apologizing.

Frequency

Movie subtitles
1.19 per million appears in 1% of films
Written text
1.08 per million

Sources

Definitions
CC-CEDICT