Against/əˈɡenst/ Definition 1 of 5Pro Tip 1/3Expressing Opposition Use 'against' to show disagreement with ideas, actions, or policies. He campaigned against the new law. Pro Tip 2/3Embedded Negativity 'Against' can imply a negative stance or conflict without stating it directly. She advised against investing in that company. Pro Tip 3/3Strength of Conviction Using 'against' often shows a strong conviction or a firm belief in the stance taken. The community stood against the closure of the local hospital.