On the line and On the spot

On the spot and on the line are semantically related in powerless topic. In some cases you can use "On the spot" instead the phrase "On the line" as a noun or an adjective, when it comes to topics like danger, vulnerable, open to attack.

On the spot adverb - At the place in question; there.

On the line and on the spot are semantically related in powerless topic. Sometimes you can use "On the line" instead the phrase "On the spot" as a noun or an adjective, if it concerns topics such as danger, vulnerable, open to attack.