The g'moro in pshochim 3 says one should (generally) use 'nice' language, like not use the word 'tomai' but 'not tahor'. The g'moro in Eruvin 53b (the last line on the page) says that when a man is ...
The way we pronounce words has changed over many years and we now have many different customs. Many of the changes derive from Jews moving to different geographic locations and adopting similar ...
(Inspired by this comment). Does halacha permit Jews to speak languages other than Hebrew? Bedieved? Lechatchilah?