O₁C₃H₄

8 points

OCH is validvalid

used to express surprise or regret [interj]

757 of 196,601 in NWL2023·also valid in CSW24

(Scots) an interjection expressing regret or impatience, also ACH [interj]

162,410 of 280,887 in CSW24·also valid in NWL2023