Definition of pickthank in US English:

pickthank

(also peckthank)

noun

archaic, literary
  • A person who curries favour with another, especially by informing against someone else; a flatterer, a sycophant; a telltale.

adjective

archaic, literary
  • Of, characteristic of, or designating a pickthank; flattering, sycophantic; talebearing.

Origin

Late Middle English. From pick- + thank, after to pick a thank.

Pronunciation

pickthank

/ˈpɪkθaŋk/