ach

exclamation2

1. •
   An expression of annoyance.

   • "Ach." Auntie frowned hugely. "That is all nonsense." — 1958
2. •
   An expression of woe or regret.

noun1

1. •
   (no longer used) Any of several species of plants, such as smallage, wild celery, parsley.

noun1

1. •
   (US) Initialism of Advanced Combat Helmet.