青あお天てん井じょう

noun

blue sky; open sky

Literally a ceiling painted or imagined as a blue sky; also used for an open-air ceiling or the sky itself.

• 温おん泉せんの露ろ天てん風ぶ呂ろは青あお天てん井じょうで、とても気き持もちがいい。

  The open-air hot spring bath has an open sky above, and it feels wonderful.

noun

skyrocketing; unlimited; the sky's the limit

Idiomatic expression for prices, costs, or values that rise without an upper bound. Often used in financial or economic contexts.

• このままでは医い療りょう費ひが青あお天てん井じょうで上あがり続つづける。

  At this rate, medical costs will keep skyrocketing without limit.

• 仮か想そう通つう貨かの価か格かくは青あお天てん井じょうだ。

  The price of cryptocurrency is unlimited; the sky's the limit.