To be down

[Nonverbis]

Two sentences:

1. Don’t worry, the temperature is down now, he is getting over it.
2. There were fluctuations in the prices but on the whole they are down.

The expression "to be down" is used here. As far as I can understand, the meaning is to decrease in amount, number, price, intensity.

Could you prove that this usage is possible? I mean to find a definition in a dictionary or something?

To me the construction seems to be more or less ok, but the problem is that I can't find it in dictionaries. Maybe it is not even ok.

 

[5jj]

Don't think of be down as 'an expression'. It's simply down (at/in a lower place) after be.

 

[Nonverbis]

down adverb - Definition, pictures, pronunciation and usage notes | Oxford Advanced Learner's Dictionary at OxfordLearnersDictionaries.com

Definition of down adverb in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

www.oxfordlearnersdictionaries.com

You think it is item 3 ( at a lower level or rate) here, don't you?

 

[Rover_KE]

Yes. Don’t you?

Don’t worry – his temperature is down now; he is getting over it.

Note my improvements to your punctuation.