classic waka stream

たらちめのなげきを積みて我がかく
おもひの下になるぞ悲しき
Roma-ji

Tarachime no nageki o tsumite waga kaku omoi no shita ni naru zo kanashiki

English Translation
Piling up for her
the kindling of my mother's grief,
that I should thus come
to lie beneath its burning fire,
this is the sorrow I feel
Meaning
How sad it is that, having heaped grief upon my mother like kindling, I should now lie beneath the funeral fire.
Commentary
Book Ten Miscellaneous Poems II 615

It is sad, the poem says, that after heaping up grief for one's mother, one should now lie beneath the funeral fire. It speaks from the place of a child who leaves the world before a parent, of the sorrow of causing a mother to grieve.
Joining nageki, grief, with nageki, firewood, and omoi, longing, with hi, fire, and tying them to tsumite, piling, and shita, beneath, as associated words, the poem overlays the scene of a cremation. The feeling of a child dying before a mother also appears in 619 in this book.

First line, 'tarachime no', means of my mother.
Second line, 'nageki o tsumite', means piling up grief, joining nageki, grief, with nageki, firewood. Tsumu, to pile, matches the stacking of wood.
Third line, 'waga kaku', means that I thus, leading to the fourth line.
Fourth line, 'omoi no shita ni', means beneath the fire, joining the hi of omoi with hi, fire. To lie beneath the fire of the stacked wood means to be cremated.
Final line, 'naru zo kanashiki', means how sad that I come to this, the particle zo answered by the attributive kanashiki.
Source
Kinyo Wakashu
Prev Poem
Yoso nagara yo o somukinu to kiku kara ni koshiji no sora wa uchishigure tsutsu
Next Poem
Sono yume o towaba nageki ya masaru tote odorokasade mo suginikeru kana