Noun old boy has 3 senses
  1. old boy, old man - a familiar term of address for a man
    --1 is a kind of man, adult male
  2. old boy - a vivacious elderly man
    --2 is a kind of
    oldster, old person, senior citizen, golden ager
  3. old boy - a male ex-pupil of a school
    --3 is a kind of
    alumnus, alumna, alum, graduate, grad
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