LINE: idioms + [advanced]

Noun arrangement of machines and workers through which a product is built in stages
Workers are building entire apartments in days on a factory floor resembling an oversized assembly line. New Yorkers might not realize it, but the world's tallest prefab building is taking shape not far from where they live.
Phrase make it harder to tell two things apart
blurring the line
NASA has discovered a star with a balmy surface temperature of 206 degrees F (97 C), blurring the line between planets and stars.
Noun a collection of styles created by a fashion designer
clothing line
Celebrity Emma Watson recently announced that she would collaborate with designer Alberta Ferretti to create a new organic clothing line.
Phrase behaving in a way that is not socially acceptable
U.S. officials said they are watching developments in Ukraine with concern and warned Russia not to take steps that could be seen as "crossing a line" and violating the country's territorial integrity.
Phrase to set a limit at something; to decide when a limit has been reached
draw the line
Where do you draw the line on smartphone use? There was a time when checking your smartphone at the dinner table was considered offensive. But social norms and behaviors change as we adapt to technologies.
Noun potentially disruptive division
Ramadan TV tests the fault line between modernity and tradition; in a rigidly controlled country television is the arena in which small rebellions can be staged and festering tensions addressed.
Noun a line marking the end of a race
finish line
The racers are placed at a center circle and, when the command is given—"Ready, Steady, Slow!"—they're let loose toward the finish line. The average speed of a snail clocks in at around 0.03 mph/0.05kph.
Noun the line of positions from which gunfire is directed
Air cannons and catapults are arranged on the firing line. It looks like they're prepared for war, but some kind of silly war with pumpkins. That's not to say that a gourd hurled with enough force can't do some damage.
Phrase at serious risk
With everything on the line, the biggest fear for any player is that they will choke. A skill they’ve practiced for years that usually comes easily to them suddenly seems hard.
Noun short joke or funny remark
When a print designer employs humour to carry the information, the result can be become a visual one-liner, a joke that speaks the message the ad intends, like this one. --My how soft you feel!