1. an effort made in opposition to or in response to another effort; a competing or opposing action or attempt
Usage: often used in contexts of competition, negotiation, or conflict

Examples

• The company launched a countereffort to compete with its rival's new marketing campaign.
• In the debate, each side presented a countereffort to undermine the other's arguments.
• The team's defensive countereffort prevented the opposing team from scoring.
• Her countereffort to improve her grades paid off with better test scores.
• The government's countereffort against misinformation included fact-checking initiatives.
• Despite the initial setback, they mounted a strong countereffort to regain market share.