pin down

US /pɪn daʊn/
UK /pɪn daʊn/
"pin down" picture
1.

確定, 查明

to understand or describe something exactly

:
It's hard to pin down the exact cause of the problem.
很難確定問題的確切原因。
I can't quite pin down what's bothering me.
我無法完全確定是什麼困擾著我。
2.

制服, 困住

to make someone stay in a particular place or prevent them from moving

:
The police managed to pin down the suspect in the alley.
警方設法在小巷裡制服了嫌疑人。
The heavy rain pinned us down in the cabin for hours.
大雨把我們困在小屋裡好幾個小時。