under or below an object or a surface; at a lower place or level; directly beneath; "we could see the original painting underneath"; "a house with a good foundation underneath"
on the lower or downward side; on the underside of; "a chest of drawers all scratched underneath"
United States tennis player who in 1938 was the first to win the Australian and French and English and United States singles championship in the same year (1915-2000)