The term "more opening" implies an increase in the number or size of openings. However, some antonyms, or words with opposite meanings, would imply the opposite -- a decrease in the number or size of openings. Some examples of antonyms for "more opening" include "fewer closures," "less spacious," or "tighter seal." These antonyms suggest that the area in question is becoming more closed off or restricted, creating a sense of confinement or limitation. Opposing terms such as these can help to clarify meaning in discussions and prevent misunderstandings between speakers.