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Webster 1913 Edition

Verb.

[F.

défalquer

. See

To lop off; to abate.

[Obs.]

B. Jonson.

Verb.

To defalcate.

defalk ‎(third-person singular simple present defalks, present participle defalking, simple past and past participle defalked)

(archaic) To reduce by deducting a part, especially when used in a financial sense.
(obsolete) To cut off, to deduct, to subtract (especially expenses or a sum of money).