Daily Chinese Idiom Guessing Game
To persistently and unremittingly continue doing something without giving up.
懈松懈。坚持到底，一点不忪懈。
《清史稿·刘体重传》煦激励兵团，坚持不懈，贼穷蹙乞降，遂复濮州。”
She studied English for years with unremitting effort, never giving up despite challenges.