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third-person singular simple present outnumbers, present participle outnumbering, simple past and past participle outnumbered
(transitive, stative) to be more in number than somebody or something. quotations examples
There are 105 D.B. Type "23" engines and they were intended to replace the famous Prussian "P8" class 4-6-0s (Type "38"), but dieselisation prevented further construction and they are greatly outnumbered by the thousand or so "P8s" which are still in service and which can be seen on a great variety of duties.
1960 September, P. Ransome-Wallis, “Modern motive power of the German Federal Railways: Part One”, in Trains Illustrated, page 553