1. What does it mean?
물타기 literally means adding water. In investing it means buying more at a lower price to reduce the average purchase price. In discussion it can mean diverting attention or blurring the main issue with another topic.
Also written or said as multagi
2. The nuance
These are different figurative senses. Lowering an average entry price does not erase losses or guarantee recovery; the financial meaning here is vocabulary, not investment advice.
3. Examples
“기사에서 물타기는 평균 매입가를 낮추는 추가 매수라고 설명했어.”
The article explained averaging down as buying more to lower the average purchase price.
“다른 얘기로 물타기하지 말고 원래 질문에 답해 줘.”
Don't muddy the issue with another topic; answer the original question.
Sources
References support the meaning and usage. Example sentences are written for NoCapWiki.