- old catholic
- old church slavic
- old colonials
- old country
- old dealer
- old dirigo
- old doc
- old dominion
- old dutch
- oil engine
- oilfield
- old english
- old floppy
- old fogy
- old folks
- old french
- old glory
- old goat
- old gold
- old guard
- old hand
- old harry
- old hat
- old high german
- old home week
- old horse
- old icelandic
- old indic
- old ionic
- old irish
- old ironsides
- old jamica
- old lady
- old lag
- old latin
- old line
- old low franconian
- old low german
- old maid
- old man
- old man river
- old master
- old moon
- old nick
- old norman french
- old norse
- old north
- old north french
- old persian
- old prussian
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