1. a government official or politician who works to break up business monopolies and trusts
Usage: historical; informal

Examples

• Theodore Roosevelt earned the nickname ‘trustbuster’ for his aggressive antitrust policies.
• The trustbuster filed lawsuits against several major corporations.
• As a famous trustbuster, she fought to prevent monopolistic practices.
• The president appointed a new trustbuster to head the antitrust division.
• Many trustbusters of the early 1900s believed large corporations had too much power.
• The trustbuster’s investigation revealed illegal price-fixing agreements.