A person who makes or seeks compromises; someone willing to give up part of their position to reach agreement.
From 'compromise' plus the agent suffix '-er' (one who does something). The -er suffix creates a noun referring to a person who performs the action of the root verb.
In politics, calling someone a 'compromiser' can be either praise (they're reasonable and pragmatic) or an insult (they lack principles). The same word means completely different things depending on your worldview—which is a perfect example of how language reflects our values!
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