di·​plo·​ma·​tize | \-məˌtīz\

Definition of diplomatize 

transitive verb

1 archaic : to confer a diploma upon

2 : to treat or manage with diplomacy : aid in the manner of a diplomatist

intransitive verb

: to act like a diplomat or with adroitness and tact : practice diplomacy

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History and Etymology for diplomatize

in sense 1 (transitive), from Latin diplomat-, diploma + English -ize; in other senses, from diplomatic entry 1, after such pairs as English dramatic: dramatize

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something that serves to warn or remind

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