IPA: /ˈæn.tɪ.trʌst/
KK: /ˈæntɪˌtrʌst/
Relating to laws or actions that prevent monopolies and promote competition in business.
The government introduced new antitrust regulations to ensure fair competition in the market.
Antitrust is formed from "anti-" (meaning against) and "trust" (from Old English "treowth", meaning faith or confidence). The term refers to laws and regulations that are against monopolistic practices and promote competition.
Think of being 'against' ('anti-') unfair 'trusts' or monopolies in business — that's what antitrust laws aim to prevent.
No commonly confused words.