tickler file

noun

a file consisting of memoranda, notices, electronic signals, or the like that serves to remind the user of matters that must be attended to.

Origin of tickler file

1795-1805

1795-1805, Americanism

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Based on the Random House Dictionary, © Random House, Inc. 2016.
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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

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