a file consisting of memoranda, notices, electronic signals, or the like that serves to remind the user of matters that must be attended to.
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How to use tickler file in a sentence
This system can be operated with the regular tickler file, but for a large number of bills the pigeon holes are more convenient.
It turns out that the file a secretary keeps to remind her boss to do certain things at certain times is called a tickler file.The Creature from Cleveland Depths | Fritz Reuter Leiber