先負

プログレッシブ和英中辞典(第4版)

せんぷ【先負】

〔六曜の一つ〕a day on which it is supposed to be better to avoid disputes and hurried actions; a day supposed to be unlucky in the morning and lucky in the afternoon

出典　小学館「プログレッシブ和英中辞典(第4版)」