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The other kids are still battling away. Snow warfare gains a new, thrilling edge when waged in the glare of police lights.

Hi,

What does "away" in the above mean?

And does "edge" mean "intensity" and "fierce?" Thanmks.
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Hi Angliholic

The word away is similar in meaning to uninterruptedly or continuously. See definition 6 here , definition 4 here, or the definition here.

The meaning of edge is more similar to keenness. I'd say definition 2 here reflects the meaning of edge as it is used in the context. Or you might say that the police lights made the snowball fight feel more intense, or gave it a more intense quality.
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AngliholicThe other kids are still battling away. Snow warfare gains a new, thrilling edge when waged in the glare of police lights.
What does "away" in the above mean?

And does "edge" mean "intensity" and "fierce?"away: continuing the activity in a somewhat single-minded way, that is, without any apparent awareness of the surroundings and without any apparent intention to stop.

Compare: singing away, dancing away, studying away, praying away, whistling away, cooking away. (All informal.)

I would paraphrase "edge" as "aspect" in this context, though the word combined with "thrilling" also suggests excitement, fervor, nervous energy, animal spirits, risk-taking, overstepping of limits (i.e., "edges"), and, as you have already mentioned, intensity.

CJ

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Comments  
"away" gives the idea that someone is busily occupied in an ongoing activity. You can add "away" in this sense to a number of verbs: "I was eating/hammering/chattering/etc. away".

"edge" here has a combination of the following senses at http://www.merriam-webster.com/dictionary/edge [1 ]:

"keenness or intensity of desire or enjoyment"

"the threshold of danger or ruin"
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