The antonyms for the word "irrupts" can be "recedes", "subsides", "ebbs", "abates", "declines", "diminishes", or "falls". These words indicate a decrease or calming down of something, rather than a sudden burst or outbreak. "Recedes" specifically refers to something moving away, while "subsides" and "ebbs" can suggest a decrease in intensity, such as in a storm or wave. "Abates" typically indicates a calming down of emotions, while "declines" and "diminishes" can refer to a reduction in quantity or quality. "Falls" can be used to indicate a decrease in numbers or level.