1. singing or speaking together as a group or in unison
Usage: present participle of 'chorus'; common in theatrical and musical contexts
2. repeating or echoing the same words or sentiment in agreement
Usage: figurative use

Examples

• The choir was chorussing the national anthem at the ceremony.
• All the students were chorussing the pledge of allegiance.
• The audience began chorussing the familiar refrain from the musical.
• Critics were chorussing their disapproval of the new policy.
• The crowd was chorussing 'We want more!' after the performance.
• The backup singers were chorussing behind the lead vocalist.