Please explain “arms race” in “the arms race between forest trees struggling to reach the light.”

My comments:

This is a good question because when we talk about an “arms race”, we are usually addressing the problem of countries producing more and more – plus increasingly deadly – weapons in order to out-compete their opponents. The erstwhile arms race between the Unites States and the former Soviet Union during the Cold War era springs uppermost to mind.

Here, in our example, however, “arms race” merely refers to the competition among forest trees to grow taller branches in order to get more sunshine.

In a thick forest, there’s little or no sunshine penetrating through thick leaves to reach ground level. There is an abundance of it, however, at the top. That compels forest trees to grow taller and taller in order to thrive – or merely survive, as trees depend on the sun for photosynthesis and survival.

If you liken sun-reaching tree branches as the arms or upper limbs of trees, then “arms race” makes some literal sense.

“Arms race” as an expression, however, refers not to human upper limbs but to weaponry, “arms” as in “call to arms”.

I guess arms (plural) gets to stand for weapons because you have to take any weaponry into one’s arms in order to inflict any pain on the enemy.

But anyways, the term “arms race” has to do with weaponry and competition (race, as in “horse race”) but nothing to do with human limbs or tree branches. But I can understand the confusion caused therein – there in our top example.

All right, here are media examples of “arms race”, sometimes involving weaponry, sometimes merely referring to a competition so fierce that it reminds people of an arms race in the military or bellicose sense:

1. While denying that NATO is being drawn into an arms race with Russia, the alliance’s Secretary-General, Jens Stoltenberg, said it will be upgrading its military capabilities.

According to the Associated Press, Stoltenberg spoke to reporters as defense ministers of NATO countries met in Brussels. The meeting ended with a decision to increase the manpower of the Response Force by up to 27,000 troops.

The Response Force is the alliance’s quickly-deployable force, whose purpose is to respond quickly to any emerging crisis.

“We want to keep our nations safe,” Stoltenberg said. “And faced with many challenges from many directions, we need to be prepared.”

The Ukraine crisis, which began in 2013 when massive Ukrainian protests forced pro-Russia President Viktor Yanukovych out of office and later developed into violent clashes between Western-backed Ukrainian forces and Russian and pro-Russian forces, has sparked severe tensions between the West and Russia. The violence has resulted in thousands of deaths on both sides.

Both Russia and NATO have been blaming each other for instigating the other into an arms race. According to Reuters, Stoltenberg said Russia’s involvement in the Ukraine crisis has forced the alliance to improve its capabilities. Moscow has also blamed the U.S. and its allies’ military activity near its borders for forcing it into an arms race.

- Arms Race: NATO Says It Won’t Be Dragged In, Begins Upgrading Capabilities, Inquisitr.com, June 30, 2015.

2. Mercedes have reviewed their Chinese Grand Prix performance and conclude that we have us a Formula 1 arms race this year between the World Champions, Red Bull and Ferrari that is set to go on the rest of the season, as the Big Three seek to eke out an advantage over one another from race-to-race.

James Vowles, Mercedes chief strategist, said in the team’s Shanghai debrief, “Ferrari and Red Bull are fierce opponents, they are World Champions they are developing the car and they are working day and night tirelessly to beat us, we are doing the same but it is an arms race of who can develop the car the fastest and who can produce the fastest car.”

“What we can’t ignore at this point in time is that, in Shanghai, Ferrari had a faster car than us. It is our duty and job to keep working tirelessly to go through to Baku and do our best to fight back against them.”

Tyres and how the respective cars treat them in varying conditions is proving to be one of the key factors of the early races and sure to have a significant influence on how the season pans out.

“The tyres this year are having an impact,” declared Vowles. “But more so than that there is a second aspect as well which is that you have three teams Mercedes, Ferrari and Red Bull that all, depending on what tyre it is and track it is, are able to have different levels of performance to each other.”

“In the case of Melbourne we were very fast on both compounds, in Bahrain were very fast on that Supersoft tyre but had more degradation and in the case of the Chinese Grand Prix, Red Bull were extraordinarily fast on the Soft tyre.”

“What that is creating is different cars with different levels of performance, depending on what the track temperature is, what the conditions are and what tyres they have fitted to the car,” explained the Mercedes man whose team have yet to win a grand prix in the first three races of the season.

- MERCEDES: WE HAVE US AN ARMS RACE, GrandPrix247.com, April 19, 2018.

3. President Donald Trump's new global missile defense plan would be too expensive and technologically taxing to effectively implement, leading experts have said.