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How to say "Single" in Japanese

Both words can translate to "single", but which should you choose?

Japanese Option A

頓服

とんぷく (tonpuku)
N1 / CEFR Syllabus
VS
Japanese Option B

一朝一夕

いっちょういっせき (ittyouisseki)
C1 / CEFR Syllabus

Nuance Contrast & Translation Difference

When translating "single" into Japanese, you must choose carefully between 頓服 and 一朝一夕. In Japanese, 頓服 (とんぷく (tonpuku)) is typically associated with "single dose (of medicine), medication taken as needed" (Syllabus Level: N1) and represents Refers to a single dose of medicine taken on an as-needed basis, typically for immediate relief of symptoms like pain or fever, rather than regularly scheduled medication. Often used in medical contexts.. On the other hand, 一朝一夕 (いっちょういっせき (ittyouisseki)) maps to "in a single day" (Syllabus Level: C1) and represents Essential structural term in CEFR C1 vocabulary syllabus.. A literal translation of "single" can often sound unnatural to native Japanese speakers if mixed up!
Bilingual Context for "頓服"
頭痛がひどい時は、頓服を飲んで安静にしている。
When my headache is severe, I take a single dose of medicine and rest.
Bilingual Context for "一朝一夕"
私は一朝一夕に興味があります。
I am interested in in a single day.

Nuance Mastery Quiz

Which Japanese word perfectly fits this blank space?

Fill in the blank: "頭痛がひどい時は、 ___ を飲んで安静にしている。" (Meaning: "When my headache is severe, I take a single dose of medicine and rest.")
🎉 Correct Answer!

Remember: "頓服" fits here because it means "single dose (of medicine), medication taken as needed" in the context of: "When my headache is severe, I take a single dose of medicine and rest.". "一朝一夕" represents "in a single day".

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