The term “ironclad performance” has its origins in history, but is still relevant in today’s workplace and with similar meaning to the source.
There was a day when countries defended themselves with magnificent
wooden warships, tall-masted and bristling with cannons. Impressive projections
of political power on the high seas, these ships succumbed to technology when
it occurred to nautical visionaries that smaller, more maneuverable ships clad
in iron plates might be less susceptible to fire (and much more difficult to
sink).