http://www.oxforddictionaries.com/definition/english/offend contains the definition.
Are people whose jobs concern the fight against crime likely to be biased jurors? ... The court decided that the presence of serving police officers and a prosecuting solicitor (an employee of the Crown Prosecution Service) on separate juries in 2004 and 2005 had not offended against principles of fairness and there were no circumstances in the cases to give rise to concerns of bias.
Source: p 168, How the Law Works, Gary Slapper
Would someone please correct my initial 'gloss' on this verb + particle?
I attached against to principles of fairness, so
offended against principles of fairness
= offended + against principles of fairness
= offended + unfairness,
but this is the opposite meaning of offended against + principles of fairness.
What are the errors above? Are there terms for them?
When should the empty preposition or particle be parsed as above?