sub ‧ di ‧ vide /ˌsʌbdəˈvaɪd, ˌsʌbdɪˈvaɪd/ BrE AmE verb [transitive]
[ Word Family: noun : ↑ divide , ↑ division , ↑ subdivision ; adjective : ↑ divided ≠ ↑ undivided , ↑ divisible ≠ ↑ indivisible , ↑ divisive ; verb : ↑ divide , ↑ subdivide ]
to divide into smaller parts something that is already divided:
Over time, developers subdivided the land.
subdivide something into something
The house was subdivided into apartments.