This is the 1189th most frequent Russian word.
долю
"Долю" means "share" or "portion."
Here, 'долю' is used as a noun meaning 'share,' referring to a portion or part of something.
Он отдал свою долю на благотворительность.
He donated his share to charity.
In this sentence, 'долю' is used in the sense of 'a fraction,' illustrating a portion of a unit.
Долю секунды он колебался перед прыжком.
For a fraction of a second, he hesitated before the jump.
'Долю' here implies 'part' or 'component,' contributing to the total of something.