"Let slide" is a phrase which means to ignore or overlook something that should have been addressed or corrected. The antonyms of "let slide" are words that imply to take action or responsibility for resolving a situation. Words like confront, challenge, address, tackle, confront, resist, oppose, and object are antonyms for "let slide." Refuse, deny, restrict, disallow, prevent, stop, prohibit, and forbid also share antonymous definitions with "let slide." It is important to understand the antonyms of "let slide" because it is a way to take action and address issues that require attention. It is always necessary to be responsible and accountable for our actions in every situation.