Tweedledum and Tweedledee

Meaning

Noun

• Two persons or organizations deemed indistinguishable in some way.
• A pair of people who spend a lot of time together, and look and act similarly.

Origin

• From Tweedledum and Tweedledee, a pair of identical characters in Lewis Carroll's Through the Looking-Glass, and What Alice Found There. Their names may have originally come from an epigram written by poet John Byrom.