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Reference information: chocks are blocks of wood or similar material placed under the keel and frames of a ship to hold them in place during assembly.
'cock-up' is a slang expression referring to something that has gone badly wrong.
Chock-a-block
This meaning was later used to give a name to the wedges of wood which are used to secure moving objects - chocks. These chocks were used on ships and are ... www.phrases.org.uk/meanings/chock-a-block.html - Cached - Similar
The translation workplace 
