'underscore life' is not correct and usable in written English.
However, you could use the phrase 'underline life' which means to emphasize the importance of something or to put emphasis on its value. For example, "Jim believes that having meaningful relationships should be a priority and he underlines life with that belief."
There is no such thing as a charmed life and the book underscores life's precariousness, reminding us not to take anyone we love for granted.
In Buenos Aires, she finds herself stranded and alone, yet seduced by the music that underscores life in the city: tango, born from lower-class immigrant voices, now the illicit, scandalous dance of brothels and cabarets.
It is the sense of Puritan fatalism that underscores New England life.
The role of the eyes in mobility, function, and enjoyment of life underscore the importance of maintaining good ocular health.
"We are delighted with the high and growing profile of the African Vaccination Week which is yet another opportunity for us to underscore the proven life-saving power of vaccines, and to encourage vaccination of children, adolescents and adults against deadly diseases", says WHO Regional Director for Africa, Dr Luis Sambo.
It's a tragic tale, though it does conclude with a next-life-in-paradise reunion to underscore the natural anguish of life on earth.
A selection of 1,000 Polaroids, on view here for the first time, underscore his preoccupation with life as a stage set.
These events appropriately underscore our sense of life's fragility, though, and particularly of the tenuousness of existing in the American West in the early 20th century.
As in earlier McMurtry novels, the many deaths in this book underscore the precariousness of life, and a melancholy sense of change and loss, shared by so many of his heroes.
The short form of the story points up Ms. Tuck's indebtedness to other writers like Joan Didion and the young Ann Beattie, and it underscores the limitations of her fictional canvas: her tendency to reinvent continually the same handful of characters and her penchant for using violent accidents to underscore the precariousness of life.
