Full Idea
Russell's theory used quantification to eliminate singular terms, which could be meaningful without denoting anything. He reparsed such sentences so they appeared as predicates instead of names.
Gist of Idea
Russell rewrote singular term names as predicates
Source
report of Bertrand Russell (On Denoting [1905]) by A.J. Ayer - The Central Questions of Philosophy IX.A.2
Book Reference
Ayer,A.J.: 'The Central Questions of Philosophy' [Penguin 1976], p.188