We found 3 dictionaries that define the word in thing:

General (2 matching dictionaries)

1. in-thing: Wordnik
2. in thing: Longman Dictionary of Contemporary English

Miscellaneous (1 matching dictionary)

3. the in thing: Idioms

▸ Words similar to in thing ▸ Usage examples for in thing ▸ Idioms related to in thing ▸ Wikipedia articles (New!) ▸ Words that often appear near in thing ▸ Rhymes of in thing ▸ Invented words related to in thing