Dictionary

sound off

intransitive verb

Definition of SOUND OFF

1
:  to play three chords before and after marching up and down a line of troops during a ceremonial parade or formal guard mount
2
:  to count cadence while marching
3
a :  to speak up in a loud voice
b :  to voice one's opinions freely and vigorously
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First Known Use of SOUND OFF

1909

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