adverb
with great effort; laboriously; ploddingly
Mimetic adverb describing steady, plodding effort, often with a sense of trudging or working persistently despite difficulty. Casual and somewhat onomatopoeic.
重い荷物をえっちらおっちら運んだ。
I laboriously carried the heavy luggage.
彼はえっちらおっちら坂を登って
He plodded up the hill with great effort.