1
general::
Phrase(s): work against someone or something
1. [for someone] to struggle against someone or something. • She worked hard against the passage of the law. • Dave worked against Betty. 2. [for something] to militate against someone or something. • This sort of works against your plan, does it not? • Everything you said works against your client.
McGrawhill's American Idioms And Phrasal Verbs