台Taivo A Taiwan Mandarin dictionary

回過頭來

huíguòtóulái

ㄏㄨㄟˊ ㄍㄨㄛˋ ㄊㄡˊ ㄌㄞˊ

Simplified 回过头来

1to turn one's head; to turn around
2(fig.) to return (to a previous point); to come back (to what one was saying before)
3(fig.) to look back (in time); to reflect on the past

Keep 回過頭來 and it comes back until you know it.