Subject + 拦下 + Object
拦下 (lánxià) means to stop, block, or intercept someone or something. The complement 下 indicates that the stopping action was successfully completed. It is commonly used in contexts like being stopped by police or security.
那辆车在路口被交警拦下了。
nà liàng chē zài lùkǒu bèi jiāojǐng lán xià le.
That car was stopped by the traffic police at the intersection.
保安把那个没有门票的人拦下了。
bǎo'ān bǎ nàge méiyǒu ménpiào de rén lán xià le.
The security guard stopped the person who didn't have a ticket.
他想闯红灯,被旁边的人拦下了。
tā xiǎng chuǎng hóngdēng, bèi pángbiān de rén lán xià le.
He wanted to run the red light but was stopped by someone next to him.