Morphological leveling
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In linguistics, morphological leveling is the generalization of an inflection across a paradigm or between words. For example, the extension of the form is to persons such as I is and they is in some dialects of English is leveling, by analogy with a more frequent form, as is the reanalysis of English irregular strong verbs as regular weak verbs, such as bode becoming bided or swoll becoming swelled.