Definition
A polite expression used to acknowledge someone's thanks, often implying that one feels they should have done more to assist.
"Thank you for taking care of my cat." "It's the least I can do, considering how much you've helped me before."
"Thank you so much for helping me move yesterday." "It's the least I can do, you're my best friend."
"Thank you for preparing the presentation for the meeting." "You're welcome, it's the least I can do, I'm glad I could help."