different between unberthing vs underthing

English

unberthing

under- +? thing

underthing (plural underthings)

(chiefly in the plural) An undergarment.
- 1928, D. H. Lawrence, Lady Chatterley's Lover
  'Have you left your underthings off?' he asked her. 'Yes!' 'Ay, well, then I'll take my things off too.'
- 1979, Lewis Yablonsky, The extra-sex factor: why over half of America's married men play around (page 64)
  My wife would never dare to buy an underthing that was anything but white or black. She thought you had to be a hooker to wear colors.

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