variants: or Big Iron
Definition of big iron
: large mainframe computers … it will wither as most customers find the courage to shift to so-called client-server systems, which are networks of smaller computers. When that happens, other IBM businesses that depend on big iron will also decline.— Stratford Sherman, Fortune, 3 Oct. 1994 Next month, several large companies will lead the charge back to big iron in an attempt to rescue unwieldy or stalled client-server projects.— Martin J. Garvey, Information Week, 7 July 1997 A few years ago the big iron would almost certainly have been provided by the likes of IBM, Hewlett-Packard or Digital Equipment Corp.— Eric Nee, Forbes, 12 Jan. 1998
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