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everything tastes of porridge
No matter how lost one gets in fantasy, the reality of day-to-day life (here represented by "porridge") is always present and cannot be ignored. Just remember, future Broadway star, that everything tastes of porridge.
keep your breath to cool your porridge
Focus on yourself and your life, rather than other people's lives and issues. Lady Martha, I strongly suggest that you keep your breath to cool your porridge, rather than intruding upon these affairs.
save one's breath
Refrain from arguing about a lost cause, as in You can save your breath; I'm not going to change my mind. This term was also put as save your breath to cool your porridge (or broth), that is, by not blowing on the too hot liquid. The idea of not expending one's breath to say something another person doesn't want to hear dates from the early 1700s.
do ˈporridge(British English, old-fashioned, informal) be in prison serving a sentence: He’s doing porridge again, this time for armed robbery.This comes from the fact that as porridge is a cheap food that makes the stomach feel full, it was often served in prisons.
See also: porridge