Question

down the line

Answer 1

Hi

 Down the road/track/line = In the future, later

Answer 2

down the line

 

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I. adverb (or adjective)
1. : to or toward the center of town : downtown
2. : all the way : fully , completely
are prepared to back the president down the line

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II. phrasal
: in the future
going to be trouble down the line — Mimi Sheraton

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down-the-line

 adverb (or adjective)
: all the way : to the end
supporting the party ticket right down-the-line
a down-the-line union man

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Webster's New Third International Unabridged Dictionary