bolt-on
UK[ˈbəʊlt ɒn]US[ˈboʊlt ɑːn]
adj
Added as an extra part or feature to something that already exists.
n
An extra part or feature that can be added to something that already exists.
Morpheme Breakdown
bolt
on
bolt
to fasten
on
attached
Etymology
The compound "bolt-on" is a modern formation from the late 20th century, originating in engineering and business jargon. It is built from the verb "bolt," meaning to fasten securely with a bolt, and the adverb "on," indicating attachment. The term literally describes something designed to be fastened onto a pre-existing structure or system. This concrete imagery of mechanical attachment was then metaphorically extended to describe any supplementary component or feature that can be easily added to an existing entity, such as software modules, corporate acquisitions, or product accessories, emphasizing ease of integration without fundamental redesign.
Analysis
Structure: bolt (to fasten) + on (attached)
bolt: From Old English, meaning a short, heavy arrow or a pin/bar for fastening. In this compound, it carries the sense of fastening or attaching.
on: From Old English, a preposition/adverb indicating position, attachment, or addition.
Examples
The software update includes several bolt-on modules for enhanced security.
The company grew through a series of bolt-on acquisitions.
This is not a core feature but a useful bolt-on for advanced users.