We found 4 dictionaries that define the word thick as two planks:

General (1 matching dictionary)

1. thick as two planks: TheFreeDictionary.com

Business (1 matching dictionary)

2. thick as two planks: Legal dictionary

Medicine (1 matching dictionary)

3. thick as two planks: Medical dictionary

Miscellaneous (1 matching dictionary)

4. thick as two planks: Idioms

Phrases: thick as two short planks, as thick as two planks, as thick as two short planks, more... ▸ Words similar to thick as two planks ▸ Usage examples for thick as two planks ▸ Idioms related to thick as two planks ▸ Wikipedia articles (New!) ▸ Words that often appear near thick as two planks ▸ Rhymes of thick as two planks ▸ Invented words related to thick as two planks