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split open the hollow place
"opened a hole in the ground" or "opened the low place." This refers to a low area of ground where Yahweh caused a spring of water to appear.
Lehi
See how you translated this in Judges 15:9
his strength returned and he revived
These two phrase mean basically the same thing and emphasize that Samson became strong again. These two statements can be combined. Alternate translation: "he became strong again" or "he was revived" (See: rc://en/ta/man/translate/figs-parallelism)
En Hakkore
This is the name of a spring of water. The name means "spring of him who prayed." (See: rc://en/ta/man/translate/translate-names)
it is at Lehi to this day
This means that the spring did not dry up but that it remained. The phrase "to this day" refers to the "present" time. Alternate translation: "the spring can still be found at Lehi, even today" (See: rc://en/ta/man/translate/figs-idiom)