What does "I can't thank you enough" mean?
The expression "can't thank you enough" means that someone is so thankful that saying thank you even a bunch of times wouldn't be enough to express their gratitude or pay back what they did for them. This expression is fairly common and can be used anytime you are super grateful or appreciative about something that someone has done for you. Ex: I can't thank you enough for fixing my roof! That would have been expensive. Ex: Thanks for all your help, I can't thank you enough!