The words "slipped off" are spelled in English as /slɪpt/ /ɒf/. The first syllable "slip" is pronounced with a short "i" sound /ɪ/. The "pp" in "slipped" indicates a doubled consonant and the final "d" is silent. The second word "off" is pronounced with a short "o" sound /ɒ/ and ends with two consonants, "f" and "f", indicating the word is pronounced with an elongated "f" sound. Together, "slipped off" is a common phrase used to describe something that has fallen or come loose.
The etymology of the phrase "slipped off" can be understood by examining the origins of its constituent words.
1. Slip: The word "slip" derives from Middle English "slippen" and Old English "slipian", meaning "to slide, glide, or fall smoothly". This term ultimately comes from the Proto-Germanic word "slipaną" which has the same meaning. It has cognates in other Germanic languages such as Old Norse "slípa" and Dutch "slippen".
2. Off: The word "off" originates from Old English "of" and is related to the Dutch "af". It has Indo-European roots and can be traced back to the Proto-Indo-European word "*apo", meaning "away from". It has various cognates in several Germanic languages including German "ab" and Swedish "av".