JLPT N1Written, formalNews, reviews

と相あいまってcombined with; together

Two things work on each other and bring about a result, good or bad: more than either would have done alone.

優すぐれた脚きゃく本ほんと俳はい優ゆうたちの繊せん細さいな演えん技ぎが相あいまって、作さく品ひんは高たかい評ひょう価かを得えた。

The excellent script and the actors' sensitive performances together earned the production high praise.

彼かれの才さい能のうは、長なが年ねんの努ど力りょくと相あいまって、ついに花はな開ひらいた。

His talent, combined with years of hard work, finally came into flower.

One factor named

Noun + と相あいまって

The other one is the topic, or was just mentioned.

Both named

A と B が相あいまって

One more factor

Noun + も相あいまって

Added to what has just been said.

Before it: A factor: the weather, the timing, a quality, a trend.
After it: What the two bring about: 高たかい評ひょう価かを得えた, にぎわった (was crowded), 深しん刻こくになった (grew serious).
Where you'll meet it: News, reviews, essays, analysis. In conversation people say 〜もあって: 天てん気きがよかったこともあって、….

In use

新しん製せい品ひんは操そう作さ性せいを大おお幅はばに改かい善ぜんした。洗せん練れんされたデザインと相あいまって、幅はば広ひろい層そうから支し持じを集あつめている。

The new product is much easier to use. Combined with its polished design, this has won it support from a wide range of people.

夜や間かんの視し界かいの悪わるさと激はげしい雨あめが相あいまって、事じ故この危き険けん性せいが高たかまった。

Poor visibility at night and heavy rain together raised the risk of accidents.

桜さくらが満まん開かいになった週しゅう末まつ、好こう天てんも相あいまって、公こう園えんは大おお勢ぜいの花はな見み客きゃくでにぎわった。

The cherry trees were in full bloom that weekend, and with the fine weather as well, the park was crowded with people out to see them.

The two have to produce something

It isn't "and also". Two good points with nothing coming of them take 上うえに or に加くわえて.

Not said: この店みせは安やすさと相あいまって、味あじもいい。

(This place is cheap, and the food is good too.)

この店みせは安やすい上うえに、味あじもいい.

この店みせは、安やすさと味あじのよさが相あいまって、いつも行ぎょう列れつができている。

With low prices and good food together, this place always has a line outside.

Now the two produce something: the line.

Close neighbours

に加えてN2

"In addition to", after a noun. It simply adds one thing to another.

大おお雨あめに加くわえて、風かぜも強つよくなってきた。

In addition to the heavy rain, the wind has been picking up too.

とともにN3

"Together with", or "as": one thing changes and another changes along with it. Neither is said to work on the other.

高こう齢れい化かが進すすむとともに、社しゃ会かい保ほ障しょう費ひも増ぞう加かしている。

As the population ages, social security costs are rising too.

Check yourself

1Which sentence sounds natural?

Choose an answer to see why.

2Which one fits?

年ねん齢れい（　　）、食たべ物ものの好このみも変かわってきた。

Choose an answer to see why.

More sentences

温おん暖だんな気き候こうと交こう通つう網もうの整せい備びが相あいまって、この地ち域いきは年ねん間かんを通つうじて多おおくの観かん光こう客きゃくを集あつめている。

The mild climate and the improved transport network together bring many tourists to the region all year round.

長なが引びく干かんばつと設せつ備びの老ろう朽きゅう化かが相あいまって、水みず不ぶ足そくは一いち段だんと深しん刻こくになった。

The prolonged drought and the aging equipment combined to make the water shortage even more serious.

この地ち域いきでは若わか者ものの流りゅう出しゅつが続つづいている。少しょう子し化かと相あいまって、地ち域いき経けい済ざいの縮しゅく小しょうが加か速そくしている。

Young people keep leaving this region. Combined with the falling birth rate, this is speeding up the shrinking of the local economy.

原げん材ざい料りょう費ひの高こう騰とうに加くわえ、人ひと手で不ぶ足そくも相あいまって、多おおくの飲いん食しょく店てんが値ね上あげを余よ儀ぎなくされた。

With raw material costs soaring and a shortage of staff on top of that, many restaurants were forced to put their prices up.