Birth
Bhishma tells the narrative of the birth of Dirghatamas in the Mahabharata (book1, Adi Parva, CIV): "There was in olden days a wise Rishi of the name of Utathya. He had a wife of the name Mamata whom he dearly loved. One day Utathya's younger brother Brihaspati, the priest of the celestials, endued with great energy, approached Mamata. The latter, however, told her husband's younger brother—that foremost of eloquent men—that she had conceived from her connection with his elder brother and that, therefore, he should not then seek for the consummation of his wishes. She continued, 'O illustrious Brihaspati, the child that I have conceived hath studied in his mother's womb the Vedas with the six Angas, Semen tuum frustra perdi non potest. How can then this womb of mine afford room for two children at a time? Therefore, it behoveth thee not to seek for the consummation of thy desire at such a time. Thus addressed by her, Brihaspati, though possessed of great wisdom, succeeded not in suppressing his desire. Quum auten jam cum illa coiturus esset, the child in the womb then addressed him and said, 'O father, cease from thy attempt. There is no space here for two. O illustrious one, the room is small. I have occupied it first. Semen tuum perdi non potest. It behoveth thee not to afflict me.' But Brihaspati without listening to what that child in the womb said, sought the embraces of Mamata possessing the most beautiful pair of eyes. Ille tamen Muni qui in venture erat punctum temporis quo humor vitalis jam emissum iret providens, viam per quam semen intrare posset pedibus obstruxit. Semen ita exhisum, excidit et in terram projectumest. And the illustrious Brihaspati, beholding this, became indignant, and reproached Utathya's child and cursed him, saying, 'Because thou hast spoken to me in the way thou hast at a time of pleasure that is sought after by all creatures,perpetual darkness shall overtake thee.' And from this curse of the illustrious Brishaspati Utathya's child who was equal unto Brihaspati in energy, was born blind and came to be called Dirghatamas (enveloped in perpetual darkness). And the wise Dirghatamas, possessed of a knowledge of the Vedas, though born blind, succeeded yet by virtue of his learning, in obtaining for a wife a young and handsome Brahmana maiden of the name of Pradweshi. And having married her, the illustrious Dirghatamas, for the expansion of Utathya's race, begat upon her several children with Gautama as their eldest.

Asya Vamasya Hymn
Dirghatamas is famous for his paradoxical apothegms[1]. His mantras are enigmas: “He who knows the father below by what is above, and he who knows the father who is above by what is below is called the poet.”

The Asya Vamasya (RgVeda 1.164) is one of the sages most famous poems. Early scholars (such as Deussen in his Philosophy of the Upanisads) tried to say that the poems of Dirghatamas were of a later nature because of there content, but this has no linguistic support which has been argued by modern Sanskrit scholars (such as Dr. C. Kunhan Raja in his translation of the Asya Vamasya Hymn). The reason earlier western scholars believed it was of a later origin is because of the monist views found there. They believed that early Vedic religion was pantheistic and a monist view of god evolved later in the Upanisads- but the poems of Dirghtamas (1.164.46) which say "there is One Being (Ekam Sat) which is called by many names" proves this idea incorrect.

Earliest Mention of the Zodiac

Some scholars have claimed that the Babylonians invented the zodiac of 360 degrees around 700 BCE, perhaps even earlier. Many claim that India received the knowledge of the zodiac from Babylonia or even later from Greece. However, as old as the Rig Veda, the oldest Vedic text, there are clear references to a chakra or wheel of 360 spokes placed in the sky. The number 360 and its related numbers like 12, 24, 36, 48, 60, 72, 108, 432 and 720 occur commonly in Vedic symbolism. It is in the hymns of the Rishi Dirghatamas (RV I.140 - 164) that we have the clearest such references.
[edit] Famous Sayings

A number of famous sayings originate from the verses of Dirghatamas.

Another one bites the dust The first time the phrase “bites the dust” appears is in the Rgveda (1.158.4-5) where the poet Dirgatama has a prayer to the divine doctors and says ‘may the turning of the days not tire me, may the fires not burn me, may I not bite the earth, may the waters not swallow me’. There are disputes on what “bites the dirt” means in sayana’s commentary in the 14th century- which means the phrase had gone out of style in India at this time as most people began to be cremated instead of buried. But we can see Dirgatama is using it as a prayer from death- such as don’t let me die and be burned, or die and be buried, or die and be thrown in the river. [Dust and dirt are often used interchangeably in old translations]

That said, the meaning of bites the dust would be – to die and be buried in the earth. It can also be used figuratively as something that has failed (or is in a state where it is as if it was dead and buried). Another one bites the dust is another one dead and buried- or another one finished