Why do we say "Hear! Hear!"? [duplicate]
Solution 1:
It is short for "Hear him! Hear him!"
Origin phrases.org
Originated in the British parliament in the 18th century as a contraction of 'hear him, hear him'.
It is at least older than this entry in Pearson's Political Dictionary from 1792.
Definition of Hear, hear
I think they still use the expression in the British parliament. Maybe one of our UK contributors can confirm that.