I give you my word and I'll never go back on it.

一言为定， 决不反悔。

《新英汉大辞典》

Chinese never go back on his words like a rat.

中国人不会言而无信像个小人。

youdao

You should never go back on your word, if possible.

如果可能，永远不要说话不算数。

youdao

But she will never go back on a boat, despite loving the sea, because of the risk that her condition could get even worse.

BBC: Holiday cruise left woman feeling permanently seasick

It's good to have Michelle Pfeiffer back, but her vamp is never called on to go beyond one note.

CNN: Review: 'Hairspray' rises high

If you've strolled through a bookstore, maybe while avoiding work on your great American novel, and walked into the section on writing, you can be forgiven if you never go back to your laptop.

NPR: Could You Be the Great American Novelist?