| n. | 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. | |
| 4. | A prong used by coopers to extract bungs from casks. |
| Noun | 1. | tickler - a file of memoranda or notices that remind of things to be done Synonyms: tickler file |