They’ ve upped taxi fares because of the rise in fuel prices. 由于燃料价格上涨，他们提高了出租车费。

up the ante (=raise the level of what is expected, offered, or risked in a situation) Protesters have upped the ante by demanding that Wright resign. 提高期望值；加大投入；加码

He upped and went, pausing only to thank us with a gracious bow. 他只稍停下来彬彬有礼地鞠了一躬向我们表示感谢就突然走了。