Psa. 78:44 KJV (With Strong’s)

And had turned
haphak (Hebrew #2015)
to turn about or over; by implication, to change, overturn, return, pervert
KJV usage: X become, change, come, be converted, give, make (a bed), overthrow (-turn), perverse, retire, tumble, turn (again, aside, back, to the contrary, every way).
Pronounce: haw-fak'
Origin: a primitive root
their rivers
y`or (Hebrew #2975)
a channel, e.g. a fosse, canal, shaft; specifically the Nile, as the one river of Egypt, including its collateral trenches; also the Tigris, as the main river of Assyria
KJV usage: brook, flood, river, stream.
Pronounce: yeh-ore'
Origin: of Egyptian origin
intow blood
dam (Hebrew #1818)
blood (as that which when shed causes death) of man or an animal; by analogy, the juice of the grape; figuratively (especially in the plural) bloodshed (i.e. drops of blood)
KJV usage: blood(-y, -guiltiness, (-thirsty), + innocent.
Pronounce: dawm
Origin: from 1826 (compare 119)
; and their floods
nazal (Hebrew #5140)
to drip, or shed by trickling
KJV usage: distil, drop, flood, (cause to) flow(-ing), gush out, melt, pour (down), running water, stream.
Pronounce: naw-zal'
Origin: a primitive root
, that they could not drink
shathah (Hebrew #8354)
to imbibe (literally or figuratively)
KJV usage: X assuredly, banquet, X certainly, drink(-er, -ing), drunk (X -ard), surely. (Prop. intensive of 8248.)
Pronounce: shaw-thaw'
Origin: a primitive root

Cross References

Psa. 105:29• 29He turned their waters into blood, and slew their fish. (Psa. 105:29)
Ex. 7:17‑21• 17Thus saith the Lord, In this thou shalt know that I am the Lord: behold, I will smite with the rod that is in mine hand upon the waters which are in the river, and they shall be turned to blood.
18And the fish that is in the river shall die, and the river shall stink; and the Egyptians shall lothe to drink of the water of the river.
19And the Lord spake unto Moses, Say unto Aaron, Take thy rod, and stretch out thine hand upon the waters of Egypt, upon their streams, upon their rivers, and upon their ponds, and upon all their pools of water, that they may become blood; and that there may be blood throughout all the land of Egypt, both in vessels of wood, and in vessels of stone.
20And Moses and Aaron did so, as the Lord commanded; and he lifted up the rod, and smote the waters that were in the river, in the sight of Pharaoh, and in the sight of his servants; and all the waters that were in the river were turned to blood.
21And the fish that was in the river died; and the river stank, and the Egyptians could not drink of the water of the river; and there was blood throughout all the land of Egypt.
(Ex. 7:17‑21)
Rev. 16:3‑6• 3And the second angel poured out his vial upon the sea; and it became as the blood of a dead man: and every living soul died in the sea.
4And the third angel poured out his vial upon the rivers and fountains of waters; and they became blood.
5And I heard the angel of the waters say, Thou art righteous, O Lord, which art, and wast, and shalt be, because thou hast judged thus.
6For they have shed the blood of saints and prophets, and thou hast given them blood to drink; for they are worthy.
(Rev. 16:3‑6)
The miracles mentioned in this and the four subsequent verses, evidently shew the power of God over the elements of nature, which at that time were the objects of Egyptian worship.

J. N. Darby Translation

And turned their rivers into blood, and their streams, that they could not drink;