tickler

tickler is a   Noun

Definition:

[1] One who, or that which, tickles.

[2] Something puzzling or difficult.

[3] A book containing a memorandum of notes and debts arranged in the order of their maturity. [Com. Cant, U.S.] Bartlett.

[4] A prong used by coopers to extract bungs from casks. [Eng.]

Synonyms: