ever so vs once more

ever so

adv

  • Used other than figuratively or idiomatically: see ever, so. 

  • Very, extremely 

once more

adv

  • Used other than figuratively or idiomatically: see once, more. 

  • Again, a further time, once again. 

How often have the words ever so and once more occurred in a corpus of books? (source: Google Ngram Viewer )