'Polish off' is a phrasal verb that tends to be used more frequently in informal speech rather than formal contexts. It generally means to finish something quickly and completely, often used in relation to food (e.g., "He polished off the leftovers in no time"), but it can also apply to tasks or projects (e.g., "She polished off the report before lunch"). In this sense, the verb 'polish' is metaphorical, suggesting a sense of tidying up or completing with some efficiency. 'Polish off' conveys an image of thorough completion with a touch of ease or nonchalance, and although it's primarily informal, it's prevalent in both spoken and written casual English. This phrase holds no negative connotations, instead suggesting satisfaction or efficiency in the completion of something.
B2
UpperIntermediate
1. To consume food completely and quickly.
He was so hungry that he polished off the entire pizza within minutes.
After the marathon, she polished off a sizable breakfast with surprising speed.
2. To finish a task or job thoroughly and rapidly.
She managed to polish off the whole project before the deadline.
He polished off the last chapter of his book in just one night.