stack up meaning
UK /stæk ʌp/ US /stæk ʌp/ 2 syllables
stack up (verb): arrange into piles or stacks.
Definition of stack up
How to pronounce stack up
stack up is pronounced /stæk ʌp/ in British English and /stæk ʌp/ in American English. It has 2 syllables.
More about stack up on Wikipedia.