pervert the course of justice
From Longman Dictionary of Contemporary Englishpervert the course of justicepervert the course of justicelawSCL to deliberately prevent a fair examination of the facts about a crime → pervertExamples from the Corpuspervert the course of justice• Another Leeds player, defender Michael Duberry, pleaded not guilty to conspiracy to pervert the course of justice.• It is claimed Metclafe inflicted grievous bodily harm to a man and then attempted to pervert the course of justice.• They are also accused of conspiring to pervert the course of justice.• Six officers were originally charged with conspiracy to pervert the course of justice and the seventh with unlawful wounding.