draw a line
— Verb
– English
～ reasonably object (to) or set a limit (on); "I draw the line when it comes to lending money to friends!"
drop a line
— Verb
– English
～ communicate (with) in writing; "Write her soon, please!"
date line
— Noun
– English
～ an imaginary line on the surface of the earth following (approximately) the 180th meridian
dividing line
— Noun
– English
～ a conceptual separation or distinction; "there is a narrow line between sanity and insanity"
district line
— Noun
– English
～ the boundary between two districts
demarcation line
— Noun
– English
～ the boundary of a specific area
delay line
— Noun
– English
～ a circuit designed to introduce a calculated delay into the transmission of a signal
dotted line
— Noun
– English
～ a line made up of dots or dashes; often used to indicate where you are supposed to sign a contract; "just sign on the dotted line"
drop line
— Noun
– English
～ a headline with the top line flush left and succeeding lines indented to the right
drive line
— Noun
– English
～ mechanism that transmits power from the engine to the driving wheels of a motor vehicle
danger line
— Noun
– English
～ a line beyond which it is dangerous to go