stack up stackstand • stackyard · · · Info · Definitions · Synonyms · Characters · · stack up · · Text Common · · Latin · · Scripts 8 · · Length 2 · · Syllables Definitions · · · (verb) arrange into piles or stacks. Synonyms: pile up, heap up, stack up. Example: "She piled up her books in my living room." · · Verb Definition 1 Synonyms · · · pile up · · Synonym 1 heap up · · Synonym 2 Characters · · space U+0020 a latin small letter a U+0061 c latin small letter c U+0063 k latin small letter k U+006B p latin small letter p U+0070 s latin small letter s U+0073 t latin small letter t U+0074 u latin small letter u U+0075