To pile up or stack items on top of one another; to place things so they form a pile or layers.
本を机の上にきれいに重ねる。
I neatly stack the books on the desk.
絵の具を何層も重ねて独特の色を出す。
By layering paint several times you can produce a unique color.
洗濯物を重ねてしまってしわがついた。
I stacked the laundry and it got wrinkled.
To repeat something many times; to accumulate experiences or occurrences so that they add up (e.g., repeating actions or accumulating experience).
彼は試行錯誤を重ねて新しい方法を見つけた。
After repeated trial and error he found a new method.
経験を重ねるごとに自信がついてきた。
With each accumulated experience my confidence grew.
失敗を重ねても諦めないで挑戦し続ける。
Even after repeated failures, keep challenging yourself without giving up.