draw a line vs draw the line

draw a line and draw the line both are verbs.

Word	Noun	Adjective	Verb	Adverb
draw a line	No	No	Yes	No
draw the line	No	No	Yes	No

As verbs, draw a line and draw the line are synonyms defined as:

draw a line and draw the line: reasonably object (to) or set a limit (on)

draw a line (verb)	draw the line (verb)
reasonably object (to) or set a limit (on)	reasonably object (to) or set a limit (on)