Pronunciation of "rather"

In this YouTube video around 7:02 the author says:

[...] rather is one of those words which can have a different meaning [...] depending on how you pronounce it.

This got me interested and I found two pronunciations in a couple of Internet dictionaries (for example Merriam-Webster and Wikitionary): with an emphasis on the first syllable or on the last. However I think I have never heard it being pronounced the second way.

How does the pronunciation change the meaning of this word and what are some examples of sentences with "rather" being pronounced by emphasizing the second syllable?

Solution 1:

The meaning of rather with stress on the second syllable is certainly. Lexico defines it as

dated British: Used to express emphatic affirmation, agreement, or acceptance.

Cambridge Dictionaries has an example pronunciation of rather with the primary accent on the second syllable. Scroll down until you get to the exclamation definition. It still has a lot of stress on the first syllable.