Word: upstack
Part of speech: Noun
Syllables: up
stack
Definition: The upper part of the stack.
Morphemes:
Affix: up-
Language: en
PoS: Prefix
Meaning: Used to indicate higher position or direction, literally or figuratively.
Affix: stack
Language: en
PoS: Verb
Meaning: To arrange in a stack, or to add to an existing stack.