Pronunciation: [flˈat wˈɒn bˈak] (IPA) 
The spelling of the phrase "flat one back" can be explained using IPA phonetic transcription. "Flat" is pronounced as /flæt/, with the "a" sound being the short "a" as in "cat". "One" is pronounced as /wʌn/, with the "u" sound being the short "u" as in "mud". "Back" is pronounced as /bæk/, with the "a" sound being the short "a" as in "cat". Together, the phrase is pronounced as /flæt wʌn bæk/.
"Flat one back" is an idiomatic expression that refers to the act of suppressing or controlling one's emotional reactions, typically by appearing unaffected or maintaining a calm and composed demeanor in a given situation.
This phrase often suggests deliberately concealing one's true emotions, particularly negative ones, and presenting a stoic or unresponsive front. It implies an individual's ability to remain unaffected or undisturbed by events or circumstances that might typically evoke strong emotional responses in most people. The term "flat" here denotes a lack of emotional fluctuation or expression, conveying a sense of emotional neutrality or detachment.
The phrase can be used in various contexts, such as personal relationships, professional environments, or situations requiring a high level of self-control. It can also relate to mental resilience and the ability to mask one's feelings when necessary. However, it is important to note that "flat one back" should not be confused with being unemotional or emotionally detached in general; it specifically represents the act of consciously suppressing emotions temporarily rather than lacking feelings altogether.
Overall, "flat one back" suggests the act of maintaining a calm and composed facade while intentionally concealing or controlling one's emotional reactions in a given situation.
