lower boom

基本解释

And if we don't lower the boom on these practices, the racket will just go on.
如果我们让这些做法继续旺盛存在，这场闹剧将继续演下去。
hlijuanzi.blog.163.com
Will you lower the boom a little bit? This will facilitate the stowage of fore part cargo.
你把吊杆降低一点好吗？这样便于前部货物的积载。
blog.sina.com.cn
The new chief of police announced today that he was going to lower the boom on drug peddlers by putting a lot more officers in neighborhoods where the situation is worst.
新的警察局局长今天宣布，他将派很多的警察到贩毒最严重的地区去，以对那些贩毒者进行严格的管制。

But the capital B boom investors have grown accustomed to is more of a lower case boom.
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Instead of chasing after retailers using the old standby of return on assets, consider a variation: Go for companies whose ROA measures will remain unscathed if and when rulemakers lower the boom on lease accounting.
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Though he didn't gussy up his music, he knew how to keep people engrossed all the same: A master of stride and boogie and bebop, he'd string his listeners along just by dancing around the theme, and then at just the right moment, he'd lower the boom, delivering a line so dazzlingly improbable that the common response was a gasp.
NPR: A Jazz Genius Goofs Off