台Taivo A Taiwan Mandarin dictionary

切入

qiērù

ㄑㄧㄝㄖㄨˋ

1to cut into
2(fig.) to get into; to delve into (a topic, issue, field etc); to enter (a market or industry); to approach from a particular angle
3(sports) to penetrate the defense
4(cinema) to cut (to the next scene)

Keep 切入 and it comes back until you know it.