Vocabulary
物心が付く
ものごころがつく
to become old enough to understand what's going on around oneself (of a child, etc.)
expression
verb
Example sentences
僕（ぼく）は母（はは）のことを知（し）らない。物心（ものごころ）がつく前（まえ）に、母（はは）が家（いえ）を出て行（でてい）ったからだ。
I don't know anything about my mother. Before I was old enough to remember, she left our home.