two–by–four 
/ˌtu:baɪˈfoɚ/ noun
plural two–by–fours /ˌtu:baɪˈfoɚ/ noun [count] US : a piece of wood that has been cut to be long and straight so that it can be used for building things and that is about 2 inches thick and 4 inches wide
▪ We used two-by-fours to build the porch.
▪ We used two-by-fours to build the porch.
