Webster's Revised Unabridged Dictionary · 1913

Bilk

Bilk ({not transcribed}) , transitive verb

[Origin unknown. Compare Balk.]

To frustrate or disappoint; to deceive or defraud, by nonfulfillment of engagement; to leave in the lurch; to give the slip to; as, to bilk a creditor. — Thackeray

Bilk , noun

1.
A thwarting an adversary in cribbage by spoiling his score; a balk.
2.
A cheat; a trick; a hoax. — Hudibras
3.
Nonsense; vain words. — B. Jonson
4.
A person who tricks a creditor; an untrustworthy, tricky person. — Marryat