One who chooses or selects; an archaic or rare term formed from the verb 'chuse' with the agent suffix '-er'.
From the archaic verb 'chuse' (choose) with the standard English agent suffix '-er,' which creates a noun meaning 'one who does X.' The word is extremely rare in historical texts and essentially obsolete in modern English.
Words like 'chuser' reveal the flexibility of English—we can add '-er' to almost any verb to create an agent noun, so someone coined 'chuser,' but it never really stuck because 'chooser' worked better and became standard!
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