noun which may take the genitive case particle 'no', adverb taking the 'to' particle
higher and higher; ever upward
Describes continuous upward movement or progression, often with a sense of striving or climbing. Used adverbially with と or as a no-adjective.
気球は上へ上へと昇っていった。
The balloon rose higher and higher.
彼は上へ上への出世を目指している。
He is aiming for ever higher career advancement.