Translation guide
The English phrase 'piling up' can refer to physical accumulation of objects, an increase in abstract things like work or problems, or the act of stacking things. Japanese uses different verbs depending on whether the accumulation is intentional or unintentional, and whether the subject is a person or the things themselves.
To express that objects, tasks, or problems are building up on their own, often in an undesirable way.
Work is piling up.
When stress piles up, you're more likely to get sick.
Intransitive verb for snow, dust, or feelings piling up. Often used for physical layers or emotional buildup.
Snow is piling up.
Frustrations piled up and I exploded.
Literally 'to become a piled mountain', used figuratively for problems or tasks piling up to an overwhelming degree.
Things I have to do are piling up.
To describe a person actively stacking objects on top of each other.
Transitive verb meaning 'to pile up' or 'to stack'. Used for loading cargo, stacking books, etc.
He piled books up on the desk.
Load cargo onto a truck (lit. pile up luggage).
Transitive verb meaning 'to pile up' or 'to stack' neatly, often in layers. Implies careful arrangement.
To describe things accumulating in a disorganized pile.
溜まる (たまる) is for things that accumulate gradually and often negatively, like stress, work, or dust. 積もる (つもる) is for physical layers like snow or dust, or for feelings building up over time. 溜まる implies a container filling up; 積もる implies a surface being covered.
English 'piling up' can often be translated directly, but for abstract concepts like 'evidence is piling up', Japanese might use 証拠が増えている (evidence is increasing) rather than a literal piling verb. Always consider whether a natural Japanese expression exists.
皿を重ねて棚にしまった。
I stacked the plates and put them away on the shelf.
Compound verb emphasizing the process of piling up one by one. Can be physical or metaphorical (e.g., building experience).
He piled up blocks to make a tower.
It's important to accumulate (pile up) experience.
Fallen leaves had piled up high.