What is the definition of word shrinking pattern?

There isn't a widely accepted term or pattern called "word shrinking pattern". It's possible you're thinking of a specific concept that hasn't been formally named, or you might be misremembering a related term.

To better understand what you're looking for, could you provide more context? For example, do you have an example of this "word shrinking pattern"?

Here are some possibilities that might be related:

* Word Formation: Perhaps you're thinking about how words can be formed by removing letters from larger words, like "cat" from "catch".

* Word Games: There are many word games that involve shortening or modifying words, like anagrams, word chain, or acrostics.

* Phonetic Changes: Some languages have sounds that shift over time, leading to words becoming shorter.

* Linguistic Analysis: Some linguistic analyses involve studying how words change in length and structure over time.

Please provide more information so I can help you find the specific concept you're looking for.