Definition of HP Sauce™ noun from the Oxford Advanced Learner's Dictionary

 

HP Sauce™

 noun
noun
BrE
 
; NAmE
 
[uncountable]
 
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a popular British make of dark brown sauce sold in tall bottles. It is made with vegetables, vinegar and spices and is eaten with various different foods, especially meat, chips (= long thin pieces of fried potato), etc. The letters HP stand for Houses of Parliament, and there is a picture of these on the label.