also: うんとこ · うんとこしょ
interjection
oof; heave-ho; grunt of effort
An exclamation uttered when exerting physical effort, such as lifting something heavy or pulling hard. Often used in a playful or colloquial tone.
「うんとこさ！」と言って、重い箱を持ち上げた。
He said "Heave-ho!" and lifted the heavy box.
See also: うんと
昔話では、「うんとこさお金をためた」のように使われることがある。
In old tales, it is sometimes used like 'saved up a lot of money'.
どっこいしょ is another common effort grunt, often used when sitting down or lifting something, similar in tone to うんとこさ.
The exact origin is uncertain. It appears to be a sound-symbolic expression mimicking the vocalization of physical effort, possibly related to うんと (a lot) with emphatic extensions.