This is not a saying - it's a simile. Something is as stiff as a board, which is a stiff piece of wood. It's just a description.
The term "stiff as a board" is used in many country's (in particular UK) to describe a person suffering aches and pains. Normally associated with muscular pain especially after periods of heavy work such as lifting and carrying.
fREIGHT oN bOARD
"Scared stiff" is an idiom that refers to being completely frozen with fear. It's origin is not known, but it has been in use since at least 1900 a. d. .
from the Latin word - Tabula. It means a board or a plank.
when my friend was bad she was stiff
The leather dried stiff and hard. She had a stiff, formal demeanor.
yes
The stiff white board placed over the chalice is called a purificator. It is used to wipe and clean the chalice after each person receives communion during a religious service.
fREIGHT oN bOARD
The Lucky Stiff - 1949 is rated/received certificates of: Sweden:15 USA:Approved USA:Passed (National Board of Review)
The more common idiom is "stiff as a board," meaning "very stiff." Unless used ironically, like "straight as a crooked stick" or "straight as a politician's promise," the expression "straight as a board" would mean "very straight." When referring to "straight as..........." the term usually is as straight as a die
fREIGHT oN bOARD
"Scared stiff" is an idiom that refers to being completely frozen with fear. It's origin is not known, but it has been in use since at least 1900 a. d. .
I believe it comes from a trait seen in oxen. They can be stubborn. When they did not want to be harnessed they made their neck go stiff in a way that prevented the harness from being properly put around their neck.
Of course, because the person who told him that might have been depriving a village somewhere of an idiot. I could walk up to Mikhail Barysnikov and tell him "you're as stiff as a board" and it wouldn't change his ability to dance one iota.
Stiff as a Board
It was how their shorts would freeze stiff as a board if they took them off when they went to bed.
I never heard of it so find a better game then green as leaf