Trademark Act Article 53

Withdraw of oppositionAn opponent may withdraw his/her opposition to a registered trademark before the disposition of such opposition is rendered.An opponent who withdrew his/her opposition to a registered trademark shall not file an opposition once more or invalidation against such opposed trademark based on the same facts, evidence and grounds as those in the withdrawn opposition.
中文原文 商標法第53條
異議人得於異議審定前,撤回其異議。
異議人撤回異議者,不得就同一事實,以同一證據及同一理由,再提異議或評定。

English translation for reference only; the Chinese text prevails. Not legal advice.