Draw up and Drop a line

Draw up verb - To bring (something) to a standstill.

Drop a line and draw up are semantically related In some cases you can use "Drop a line" instead a verb "Draw up".

Drop a line verb - Communicate (with) in writing.

Draw up and drop a line are semantically related in put language down on paper topic. Sometimes you can use "Draw up" instead a verb phrase "Drop a line".