Underpining or Underpinning: How To spell?
The word Underpining is misspelled against Underpinning, a noun meaning "That by which a building is underpinned; the material and construction used for support, introduced beneath a wall already constructed."
Underpinning has double "nn" is mispronounced as "n"Remember double 'NN' in between the strings underpi & ing which should not be misspelled with single 'N'
Wrong Spelling: underpi-n-ing Correct Spelling: underpi-nn-ing
Find more wrongly spelled words of Underpinning to spell it well.