to whom it may concern
To the appropriate recipient for this message, as in I didn't know who was responsible for these complaints so I just addressed it “to whom it may concern.” This phrase is a formula used in letters, testimonials, and the like when one does not know the name of the proper person to address. [Second half of 1800s]
Words nearby to whom it may concern
to the teeth,
to the tune of,
to the victor belong the spoils,
to the wall,
to wake the dead, loud enough,
to whom it may concern,
to windward,
to wit,
to-and-fro,
to-be,
to-do