holder-on

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

The Ultimate Dictionary Awaits

Expand your vocabulary and dive deeper into language with Merriam-Webster Unabridged.

1. Expanded definitions
2. Detailed etymologies
3. Advanced search tools
4. All ad-free

Discover what makes Merriam-Webster Unabridged the essential choice for true word lovers.

Start Your Free Trial Now