old man

• oldman (nonstandard)
• old-man (nonstandard)

old man (plural old men)

1. Used other than with a figurative or idiomatic meaning: see old,‎ man.
2. (slang) One's father.

   "He smacked me around some. Didn't everybody's old man?"

3. (slang) A husband, or significant other.
4. (slang) One's male employer.

   Synonyms: boss, governor

5. (slang, military) A unit's commanding officer, or the commander of a naval vessel.
6. (Britain, dated) Term of address for a male friend.
   • 1934, P. G. Wodehouse, Right Ho, Jeeves

     “Don't mention it, old man,” I responded courteously.

   • 1958, H. E. Bates, The Darling Buds of May

     'Coming up, coming up, coming up,' Pop said. 'There you are, Charley, old man. Larkin Special. Don't ask what's in it. Don't stare at it. Don't think. Just drink it down. In ten minutes you'll feel perfick again.'

7. (herbs) Synonym of southernwood
8. Unregenerate human nature.

Except for the term of address for a friend, to use the phrase to the face of one's father, employer, etc. would be considered disrespectful or insubordinate.

• (elderly man): codger; see also Thesaurus:old man
• (father): dad, pa, pop; see also Thesaurus:father
• (husband): hubby
• (dated: male friend): old bean, old chap

• old lady
• old woman
• old chap

• Almond, Dolman, Lamond, Maldon, almond, dolman