crash diet
US /ˈkræʃ ˌdaɪ.ət/
UK /ˈkræʃ ˌdaɪ.ət/

1.
жесткая диета, экспресс-диета
a diet that involves eating very little food, often with the aim of losing weight quickly
:
•
She went on a crash diet to fit into her wedding dress.
Она села на жесткую диету, чтобы влезть в свадебное платье.
•
Crash diets are often unhealthy and unsustainable.
Жесткие диеты часто нездоровы и неустойчивы.