We found 4 dictionaries that define the word as thick as a plank:

General (1 matching dictionary)

1. as thick as a plank: TheFreeDictionary.com

Business (1 matching dictionary)

2. as thick as a plank: Legal dictionary

Medicine (1 matching dictionary)

3. as thick as a plank: Medical dictionary

Miscellaneous (1 matching dictionary)

4. as thick as a plank: Idioms

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