The phrase "puts stopper in" refers to stopping or preventing something from happening or continuing. To express the opposite meaning, we can use antonyms such as "allows," "facilitates," "encourages," or "promotes." For instance, instead of putting a stopper in something, we can allow it to proceed or facilitate its progress. Similarly, instead of hindering or obstructing, we can encourage or promote growth, development, or advancement. Antonyms play an essential role in communication and add depth and nuance to the language. Therefore, it's crucial to familiarize oneself with them and use them appropriately to convey the intended meaning effectively.