Definition of US in English:

US

  • 1United States.

  • 2British Undersecretary.

  • 3British informal Unserviceable; useless.

Definition of us in English:

us

pronoun

  • 1Used by a speaker to refer to himself or herself and one or more other people as the object of a verb or preposition.

    ‘let us know’
    Compare with we
    ‘we asked him to come with us’
    ‘both of us’
    1. 1.1Used after the verb “to be” and after “than” or “as”
      ‘it's us or them’
      ‘they are richer than us’
    2. 1.2North American informal To or for ourselves.
      ‘we got us some good hunting’
  • 2informal Me.

    ‘give us a kiss’

Usage

Is it correct to say they are richer than us, or is it better to say they are richer than we (are)? See personal pronoun and than

Origin

Old English ūs, accusative and dative of we, of Germanic origin; related to Dutch ons and German uns.