Meaning of わきまえる in Japanese

Definition of わきまえる

わきまえる(wakimaeru) 【弁える】

(v1, vt) to know (right from wrong); to discern; to discriminate; to understand; to bear in mind

Therefore it is important for us to be aware of other forms of politeness.

君きみはその年齢ねんれいなのだから、もっと分別ふんべつをわきまえるべきだ。

You ought to know better at your age.