Antonyms for the phrase 'cause to understand' include confuse, baffle, mystify, mislead, obfuscate, obscure, and confound. These words have opposite meanings to 'cause to understand' as they indicate the inability to provide clarity or comprehension. When we confuse someone, we cause them to feel perplexed or to not understand something clearly. When we obfuscate or obscure information, we make things unclear or difficult to understand. Similarly, when we mislead or confound someone, we cause them to not understand the truth or be uncertain about a situation. By using antonyms for 'cause to understand,' we can better understand the importance of clear communication and the harm that confusion or obfuscation can cause.