draw the line at
Refuse to go any further than, as in I draw the line at giving them more money. This expression alludes to a line drawn at a stopping point of some kind. [Late 1700s]
Words nearby draw the line at
draw slide,
draw straws,
draw table,
draw the curtain,
draw the line,
draw the line at,
draw top,
draw up,
draw weight,
draw-gate,
draw-loom