"Aler sans jour" is a French expression that means "to leave without notice." The phonetic transcription of this phrase is [a.le sɑ̃ ʒuʁ], pronounced as "al-ay sahn joor." The spelling of this phrase reflects the French language's characteristic silent letters and nasals, such as the silent "s" in "sans" and the nasal "n" in "sans" and "jour." Overall, the phrase's spelling aligns with French orthography and is crucial to learn when studying the French language.