あってこその

expression, noun-modifying (irregular)

only possible because of; owes everything to; exists solely due to

Emphatic version of あっての, used as a prenominal phrase to stress that something is entirely dependent on the presence or existence of the preceding noun.

See also: あっての · こそ

• 健けん康こうあってこその幸しあわせだ。

  Happiness is only possible because of good health.

• お客きゃく様さまあってこその商しょう売ばいです。

  Our business owes everything to our customers.