Will you please tell me what the sentence below means?
They are almost out of energy.
The phrase I'm out of energy means: I'm tired, and not energetic.
The phrase is used in various contexts, and could be used to describe mental energy or physical energy.
For example, a basketball player might be out of energy, and ask for a sub to come into the game, so he can rest on the bench.
Or, on Friday afternoon after a hard week at work, a teacher may be out of energy. This means – those essays her students just handed in? She will carry them home, and grade them on Saturday after a good night's rest. She doesn't have enough mental alertness to deal with them right now.
I'd also say that the phrase is somewhat figurative. Many times, people who say they are "out of energy," actually have could be more energetic, but they are just wanting to relax. For example, the basketball player is probably not on the verge of collapsing, but he probably won't play very good defense. The teacher probably could grade the papers if she really needed to, but it's not an ideal time to do so.
The expression could also be used to describe teams, too, and not just individuals:
After the German team scored their first two goals, the Brazilian team seemed to lose their energy.
This doesn't necessarily mean that the Brazilian team looked tired, but it could also mean that they looked discouraged, and played with no heart.
I wouldn't consider it as an idiom, because it is pretty straightforward. I can think of two types:
After you exercise, you are out of energy (hungry, tired, can't catch your breath)
In a videogame, you are out of energy (a variable for energy in programming)
It means "exhausted" or "tired".
The phrase "out of" means "to have no" or "don't have", so, you used to have but now you don't have it anymore. You could say "I'm out of milk", which means "you had milk but now you don't have it".
It means to be tired, hungry, exhausted and not energetic.
They are out of energy.
So when you use this, you specify that you don't have enough power to do it. You can be hungry or tired.
Also you can use for other things like:
They are out of drink.
Now, you specified that they had a drink but they don't have right now.
They seemed to have lost their energy.
Now, specified that they weren't energetic like tired.
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