Word: understairs
Part of speech: Noun
Syllables: un
der
stairs
Definition: A basement or cellar constructed, or accessed, from underneath the stairs.
Morphemes:
Affix: under-
Language: en
PoS: Prefix
Meaning: Under (in any sense): insufficient, insufficiently, below what is correct; subordinate to; beneath or behind.
Affix: stair
Language: en
PoS: Noun
Meaning: A series of steps; a staircase.
Affix: -s
Language: en
PoS: Suffix
Meaning: Used to form many pluralia tantum (nouns that are almost or entirely without singular forms).