You know what it looks like… but what is it called?
TAKE THE QUIZ“two by”
The following 4 entries include the term two by.
two-by-four
noun: a piece of lumber approximately 2 by 4 inches as sawed and usually 1 1/2 by 3 1/2 inches when dressed
two-by-four
adjective: small or petty of its kind
two-by-twice
adjectivetwo by two
idiom: two at a time : first two and then another two, etc.
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Merriam-Webster unabridged