Incessant and continuous is not an idiom and it is not a happy phrase. Incessant, continuous works; or inverted into continuous, incessant; or separated with another idea e.g. continuous and seemingly incessant.
its an idiom but i guess it could be considered a phrase too in a way?
Yes
Can you figure out the meaning by defining the terms? Yes, so it's a phrase instead of an idiom.
The phrase "laid eyes on" is an idiom.
An idiom is a phrase that doesn't make any sense unless you know the idiomatic definition. This phrase means exactly what it looks like, so it's not an idiom.
An idiom is a phrase that doesn't make any sense unless you know the definition. This phrase makes perfect sense, so it is not an idiom. The room became quiet.
idiom
yes
to do nothing nothing to do
Yes it is.
A phrase unique to a particular language is called an "idiom." Idioms often have meanings that cannot be derived from the individual words used in the phrase.
Stuck in a rut is a phrase, but I am not sure if an idiom is the same thing as a phrase. You may be thinking of a cliche and "stuck in a RUT" is a cliche. "Stuck in a road" is neither cliche nor idiom.