Translation guide
How to express the concept of 'injection' in Japanese, covering medical shots, mechanical/chemical injection, and figurative uses.
To refer to receiving or giving a medical injection, such as a vaccine or medicine.
The most common and general term for a medical injection. Can be used as a noun or with する to mean 'to give/receive an injection'.
Yesterday, I got a flu shot.
Many children are afraid of injections.
Specifically refers to a vaccination or immunization shot. Used for preventive injections.
Next week, I'm taking my child for a vaccination.
Refers to vaccine administration, often used in public health contexts.
Vaccination is progressing.
To describe the act of forcing a liquid or gas into something, such as in engineering or cooking.
General term for injecting or pouring a liquid/gas into something. Used in technical and everyday contexts.
Inject fuel into the engine.
Refers to spraying or jetting a liquid/gas, often under pressure. Common in automotive and industrial contexts.
To express the idea of adding something (like funds, energy, or a new element) into a system or situation.
Also used figuratively for injecting capital, energy, or ideas. Often paired with words like 資金 (funds) or 活力 (vitality).
The government injected funds into the market.
Means 'to throw in' or 'to input', often used for injecting resources, effort, or money into something.
To refer to the cybersecurity attack where malicious code is inserted into a program.
Loanword from English, commonly used in IT contexts. Often combined with the type, e.g., SQLインジェクション.
We need measures against SQL injection.
Literal translation 'code injection', sometimes used but less common than the loanword.
Prevent code injection attacks.
注射 is specifically for medical injections (shots). 注入 is for injecting liquids/gases into something, or figurative injection of resources/ideas. Using 注射 for non-medical contexts sounds odd.
In automotive contexts, 燃料噴射 (fuel injection) or 燃料注入 is used, not 注射. 注射 is only for medical syringes.
Inject cream into the cake.
The fuel injection system broke down.
Inject new ideas into the project.
会社は新技術に多額の資金を投入した。
The company injected a large amount of money into new technology.