a treat

یک سورپرایز

idiom UK informal
very well; with good results
اصطلاح، انگلیسی بریتانیایی، غیر رسمی
خیلی خوب؛ با نتایج خوب
To prevent red wine from staining, put some salt on it - it works a treat.
That soup went down a treat ( = was very enjoyable ) !

منابع

• https://dictionary.cambridge.org/dictionary/english/treat