Godan verb with 'ru' ending, Intransitive verb
to lean (to one side); to incline
ハンバーガーばかり食べていると、栄養が偏るよ。Your diet is going to be really unbalanced if all you eat is hamburgers. to be unbalanced (e.g. diet); to be unduly weighted towards; to be concentrated on
to be partial; to be biased; to be prejudiced
Also written 片寄る【かたよる】