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Webster 1913 Edition

adv.

In a proverbial manner; by way of proverb; hence, commonly; universally;

as, it is

proverbially

said; the bee is

proverbially

busy.

adv.

In a proverb; as, it is proverbially said.

proverbially ‎(comparative more proverbially, superlative most proverbially)

In a manner that uses proverbs; in proverbs.
the bee is a proverbially busy creature
In a manner reminiscent of a proverb.