The structure is an initialism standing for "Not Safe For Work." It is used as a content warning to label material such as nudity, explicit language, graphic violence, or sexual content that could get someone in trouble if viewed in a professional or public setting. People typically add "NSFW" before sharing a link, image, or video so others know not to open it at work or around children.

英語での「not safe for work」の定義と意味

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