丁ちょうと

adverb

with a clang; with a bang; with a crash

Onomatopoeic adverb describing a loud, sharp metallic or crashing sound, often from a single impact.

• 鉄てつの扉とびらが丁ちょうと閉しまった。

  The iron door shut with a clang.

• 鍋なべが床ゆかに落おちて丁ちょうと大おおきな