From The Collaborative International Dictionary of English v.0.44 [gcide]:
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.]
From WordNet (r) 2.0 [wn]:
noun
1: a file of memoranda or notices that remind of things to be done [syn: {tickler file}]
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Let's see what we can do if we put our heads together.
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