shave something off something
phrasal verb with shave verb [ I or T ] uk/ʃeɪv/ us/ʃeɪv/
(also shave something by something)
将…减少（一定量）
to reduce something by the stated amount
The new high speed trains will shave 25 minutes off the journey time. 新的高速火车将使旅途的时间缩短25分钟。
Our prices have been shaved by five percent! 我们的价格下降了5%！