The phrase "let ride" typically refers to allowing something to continue or letting it go without interference. Antonyms for this phrase would express the opposite sentiment, suggesting that action should be taken instead. Words that serve as antonyms for "let ride" might include words like "intervene," "intercede," "meddle," or "interrupt." These words indicate that it is appropriate to step in and take control of a situation, rather than allowing it to continue on a course that may not be desirable. Alternatively, antonyms for "let ride" could be positive phrases that encourage action, such as "take charge," "become involved," or "take responsibility.