a tenant who rents from someone who is renting the property (i.e. another tenant)
undertenant in American English
(ˈundərˌtenənt)
noun
a subtenant
Derived forms
undertenancy
noun
Word origin
[1540–50; under- + tenant]This word is first recorded in the period 1540–50. Other words that entered Englishat around the same time include: cabinet, gondola, labyrinth, monitor, telltaleunder- is a prefixal use of under, as to indicate place or situation below or beneath (underbrush; undertow); lower in grade or dignity (undersheriff; understudy); of lesser degree, extent, or amount (undersized); or insufficiency (underfeed)