bolt-on UK /bəʊlt ˈɒn/US /ˌbolt ˈɔn/noun 3adjective 2forms 1 noun3 •An accessory that can be bolted on or otherwise attached.Should not a curriculum for the twenty-first century be organised more effectively around the new technology? At present, it remains an addition to most subjects – a bolt-on. — 2011 •(figurative) A functionality or service that can be added to an existing arrangement or plan (for example, a mobile telephone subscription).PureGym (puregym.com), which has more than 200 gyms across Britain, charges from £8.99 to £17.99 a month, with "bolt ons" available. — 2018 •(slang) A breast implant. adjective2 •Of an accessory: capable of being bolted on or otherwise attached.Marketing is not an option, a bolt-on activity, or for moments when 'time allows'; it must be present all the time as the company goes about its business. — 1997 •(figurative) Used to extend an existing system, operating as an add-on or plug-in. formsbolt-ons
