| ̷ ̷ ̷ ̷| ̷ ̷ noun
( plural holders-on or holder-ons )
1. : a worker who bucks rivets
2. : a pneumatic tool used in place of a dolly to back up rivets while they are being headed
| ̷ ̷ ̷ ̷| ̷ ̷ noun
( plural holders-on or holder-ons )
1. : a worker who bucks rivets
2. : a pneumatic tool used in place of a dolly to back up rivets while they are being headed
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012