This is a guide for men, a distinguisher between right and wrong.
He is the poet or maker of words, as in civilised ages the dialectician is the definer or distinguisher of them.
Be a careful and accurate (though not a vain) distinguisher; and suffer not ambiguity and confusion to deceive you.
1560s, from Middle French distinguiss-, stem of distinguer, or directly from Latin distinguere "to separate between, separate by pricking," from dis- "apart" (see dis-) + -stinguere "to prick" (see extinguish, and cf. Latin instinguere "to incite, impel").
The suffix -ish is due to the influence of many verbs in which it is the equivalent of Old French -iss-, ultimately from Latin inchoative suffix -iscere (this is also the case in extinguish, admonish, and astonish). Related: Distinguishing. The earlier form of the verb was distinguen (mid-14c.).