n.[C]

1. 气压计；晴雨表
   The barometer falls.

   气压下降了。（或：天要下雨了。）

2. 【喻】晴雨表，显示变化的事物
   The stock market is a barometer of business.

   股票市场是商业的晴雨表。

n.

1. an instrument measuring atmospheric pressure, used especially in forecasting the weather and determining altitude.
2. an indicator of change:
   furniture is a barometer of changing tastes.