1A board fitted with teeth, used for making drawn work from linen.
（亚麻纱做抽绣时用的）带齿木板
2North American
another term for washboard (sense 1 of the noun)
Example sentencesExamples
At first it bothered me, for I was used to changing the linen every week, but it was difficult to wash clothes with the rub board and to heat the water in pails on the stove.
When school was not in session I'd go back outside after breakfast and get out Grandma's rub board and wash paddle, shave some home made lie soap into the first pot and stoke the fires some more.
After the solution came to a boil the pot was filled with sheets, pillow cases and towels which had been scrubbed on a rub board.
Definition of rub board in US English:
rub board
noun
1A board fitted with teeth, used for making drawnwork from linen.
（亚麻纱做抽绣时用的）带齿木板
2North American
another term for washboard (sense 1 of the noun)
Example sentencesExamples
After the solution came to a boil the pot was filled with sheets, pillow cases and towels which had been scrubbed on a rub board.
At first it bothered me, for I was used to changing the linen every week, but it was difficult to wash clothes with the rub board and to heat the water in pails on the stove.
When school was not in session I'd go back outside after breakfast and get out Grandma's rub board and wash paddle, shave some home made lie soap into the first pot and stoke the fires some more.