noun

1. One of an array of compartments for housing pigeons.

2. One of an array of compartments for receiving mail and other messages at a college, office, etc.

   “Fred was disappointed to find his pigeonhole empty except for bills and a flyer offering 20% off on manicures.”

3. One of an array of compartments for storing scrolls at a library.

verb

1. To categorize; especially to limit or be limited to a particular category, role, etc.

   “Fred was tired of being pigeonholed as a computer geek.”

2. To put aside, to not act on (proposals, suggestions, advice).

Synonyms: glove box, mothball, shelve, table