substring verb 2noun 1forms 3 verb2 •To extract a substring from.If an existing character-based column is increased in size and your program does not need the extra characters, the view can be changed to force the smaller size by substringing the existing column. — 2015 •To take as a substring.In this example, knowing that MY_SOUNDEX returns at most six characters, we are substringing the first six characters. — 2010 noun1 •A (possibly zero-length) string of characters that is contained in another string.The substrings of "button" include "butt", "ton", and "on". formssubstringed · substringing · substrings