line drawing
noun
• a drawing done using only narrow lines, without blocks of shading.
draw the line
• set a limit on what one is willing to do or accept.
• "I draw the line at a pizza with anchovies on it"
Similar:
stop short of,
refuse to accept,
draw a line in the sand,
balk at,
object to,
take issue with,
take exception to,
put one's foot down about,
Opposite:
approve of,