You know what it looks like… but what is it called?
TAKE THE QUIZ“of line”
The following 4 entries include the term of line.
heir of line
nounmile of line
: a unit for expressing the distance between points connected by railroad line as distinct from the amount of trackage composing the line
out of line
idiom: beyond what is reasonable or allowable : not right or appropriate
step out of line
idiom: to disobey rules or behave badly
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Merriam-Webster unabridged