観かん測そく気き球きゅう

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Meanings

1

weather balloon; sounding balloon

A balloon used for meteorological observation, carrying instruments to measure atmospheric conditions.

気き象しょう庁ちょうは毎まい日にち観かん測そく気き球きゅうを飛とばしている。
The meteorological agency launches weather balloons every day.

2

observation balloon; spy balloon

A balloon used for surveillance or reconnaissance, often in military or espionage contexts.

敵てき軍ぐんは観かん測そく気き球きゅうを使つかってこちらの陣じん地ちを偵てい察さつした。
The enemy forces used an observation balloon to scout our position.

3

trial balloon

Figurative use: a tentative measure or statement to test public opinion or reaction, similar to the English idiom.

政せい府ふは増ぞう税ぜいの観かん測そく気き球きゅうを上あげたが、世よ論ろんの反はん発ぱつは強つよかった。
The government floated a trial balloon about a tax increase, but public backlash was strong.