バウンスFreq.FrequencyTop 100,000Meanings1nounbounce (email)internetUsed in IT contexts for an email that is returned to the sender because it could not be delivered.送そう信しんしたメールがバウンスされて戻もどってきた。The email I sent bounced back.バウンス率りつが高たかいと、メールの到とう達たつ率りつが下さがる。A high bounce rate lowers email deliverability.