Pronunciation: [ɹˈɛst əʃjˈʊ͡əd] (IPA) 
Rest assured is a commonly used phrase that means to be certain or confident about something. The pronunciation of the word rest is /rɛst/ and the pronunciation of assured is /əˈʃʊrd/. In this phrase, the stress falls on the second syllable of assured. The phonetic transcription can be represented as /rɛst əˈʃʊrd/. It is important to spell and pronounce words correctly in order to communicate accurately and effectively.
"Rest assured" is a phrase that signifies reassurance, comfort, and certainty in a given situation. It is typically used as a gesture aimed at alleviating any concerns, doubts, or worries one might have by offering them peace of mind.
The phrase can be considered a form of assurance or guarantee that emphasizes confidence and conviction. When someone says "rest assured," they are essentially assuring the person they are addressing that there is no need to worry, fret, or be anxious about a particular matter.
"Rest assured" implies that the person speaking is confident in the outcome or action being discussed and firmly believes that there is no reason for doubt or unease. It is a declaration that engenders trust and implies that the situation is well under control or that the person speaking possesses the necessary ability or knowledge to handle it competently.
The phrase often serves to provide comfort in times of uncertainty, offering a sense of relief and relaxation. It conveys the message that everything will be taken care of and that the person being addressed can put their mind at ease. In essence, "rest assured" is an expression used to instill confidence, trust, and tranquility in another person, assuring them that their concerns have been acknowledged and will be resolved satisfactorily.
The phrase "rest assured" originated from the combination of two words: "rest" and "assured". Prior to the 15th century, the Middle English word "reste" meant to remain still or to relax. It derived from the Old English word "ræste". Additionally, the word "assured" comes from the Latin word "assurare", which means to give confidence or make secure. Together, these words formed the phrase "rest assured", implying a sense of trust, confidence, and security.
