Four-by-four Definition
    noun
  
 A four-wheel-drive motor vehicle.
 American Heritage 
A length of lumber that is 4 inches thick and 4 inches wide, or that is trimmed to slightly smaller dimensions.
 American Heritage 
Other Word Forms of Four-by-four
Noun
Singular:
 four-by-fourPlural:
 four-by-foursFind Similar Words
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