A bucket of mud can mean a 5 gallon bucket of mortar around half to 3/4 full. Mortar is often referred to as mud. To define it better:
A sack of dry mortar is called exactly that - A sack of mortar.
When mortar is mixed with brick sand and water - it is known as mud...even though there is no dirt involved. It is a slang term used for centuries.
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