A turn-off 令人扫兴或者突然失去兴趣的事(行为, 气味, 坏境等让人反感)
e.g. His arrogance is a real turn-off. 他的傲慢真是令人反感。
e.g. His constant bragging about his achievements was a real turn-off. 他不停地炫耀自己的成就真是让人反感。
e.g. I find smoking to be a big turn-off. 我觉得抽烟很令人反感。
备注: 一般和turn-off 搭配的形容词是
major (主要的)--a major turn-off
big (大的) --a big turn-off
real (真正的) --a real turn-off
complete (完全的) -- a complete turn-off
total (完全的) -- a total turn-off