(かさ)ねる

かさねる
verb (ichidan)
to pile up, to stack, to repeat
1. to pile up, to stack
To place things one on top of another.
(さら)(かさ)ねる。
To stack plates.
(ぬの)二枚(にまい)(かさ)ねる。
To layer two pieces of cloth.
(だん)ボール(ばこ)(みっ)(かさ)ねて(たな)(うえ)()いた。
I stacked three cardboard boxes and put them on top of the shelf.
2. to repeat, to accumulate
To do something repeatedly over time.
努力(どりょく)(かさ)ねる。
To make repeated efforts.
(とし)(かさ)ねる。
To grow older.
Lit: to pile up years
何度(なんど)(はな)()いを(かさ)ねた結果(けっか)、ようやく合意(ごうい)(たっ)した。
After repeated discussions, they finally reached an agreement.

(かさ)ねる means to pile up or stack (literally), and to repeat or accumulate (figuratively).

TRANSITIVITY:

  • Type: 他動詞(たどうし) (transitive)
  • Pair: (かさ)なる (intransitive, "to pile up")

ASPECT (ている):
(かさ)ねている indicates an ongoing state of having been stacked, or continued repetition.

COMMON PATTERNS:

  • (さら)(かさ)ねる: to stack plates
  • 努力(どりょく)(かさ)ねる: to make repeated efforts
  • (とし)(かさ)ねる: to grow older (lit. pile up years)
  • 経験(けいけん)(かさ)ねる: to accumulate experience
  • (はな)()いを(かさ)ねる: to have repeated discussions

The figurative sense emphasizes gradual accumulation over time.