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Wiktionary
change over

vb. (context transitive idiomatic English) to convert to, to make a transition from one system to another

WordNet
change over
  1. v. make a shift in or exchange of; "First Joe led; then we switched" [syn: switch, shift]

  2. change from one system to another or to a new plan or policy; "We converted from 220 to 110 Volt" [syn: convert]

Usage examples of "change over".

Nevertheless, a lot could change over four decades, and I couldn't dismiss the possibility that once upon a time the attorney had possessed a hearty appetite for crow.

We intend this constitution to be a flexible document subject to change over time in the light of experience and changing historical conditions, but assert here that we hope to establish a government that will forever uphold the following principles: the rule of law.