Hear! hear!
Definition 1 of 1
Pro Tip 1/3British Origin
The phrase is traditionally British and often used in the UK Parliament to show strong agreement. 
MP: 'We require more funds for healthcare.' Parliament: 'Hear! Hear!'
Pro Tip 2/3Group Settings
Mostly used in group discussions or meetings as a collective expression of agreement. 
Leader: 'We need shorter meetings.' Team: 'Hear! Hear!'
Pro Tip 3/3Supportive Echo
Expressing your support loud enough for others to hear amplifies the speaker's point. 
Activist: 'Equal rights for all!' Crowd: 'Hear! Hear!'