n.

1. 门槛[C]
   He had never crossed the threshold of a bar before.

   他过去从未进过酒吧的门。

2. 出发点，开端，起点[S]
   Scientists are on the threshold of a breakthrough in their treatment of that disease.

   科学家在治疗那种疾病方面很快就要取得突破。

3. （税的）起征点[S]
   The tax threshold for a pensioner is $6,000.

   领退休金的人的纳税起点是六千美元。

4. 【生】【心】阈[C]
5. （工资、价格的）起增点

n.

1. a strip of wood or stone forming the bottom of a doorway and crossed in entering a house or room.
2. a level or point at which something starts or ceases to happen or come into effect.
   ▸the level at which one starts to feel or react to something:

   a low pain threshold.