Translation guide
Expressing that two or more things are used together, in combination, or jointly. Japanese uses compound verbs, nouns with 併用, or adverbial phrases depending on the context.
To say that you use A and B together, often for a specific purpose or effect.
The most direct and common way to say 'use A and B together'. 併用 means 'combined use' or 'using together'. It is neutral and can be used in both spoken and written contexts.
In this treatment, we use medication and exercise together.
Literally 'use A and B by combining them'. This is very natural and emphasizes the act of combining. Slightly more conversational than 併用.
It's convenient if you use this software and that app together.
Noun meaning 'combined use'. Often used in technical or medical contexts. Can be used as a suru-verb (併用する).
Very casual and common. 'Use A and B together'. 一緒に means 'together'. Suitable for everyday conversation.
Please use this detergent and fabric softener together.
To express that a space, tool, or service is shared or used jointly by multiple parties.
Noun meaning 'shared use' or 'common use'. Often used for facilities, equipment, or spaces. Can be used as a suru-verb (共用する).
This kitchen is for shared use by the residents.
Literally 'use jointly'. 共同 means 'joint' or 'cooperative'. Emphasizes the collaborative aspect.
Loanword from English 'share'. Very common in casual contexts, especially for sharing resources or information.
I share this car with my roommate.
To express that an action is done together with another action, often using compound verbs with 兼ねる or 合わせる.
Pattern meaning 'do B while also serving as A' or 'do B, also functioning as A'. Useful when one action has a dual purpose.
I'm going on an overseas trip, which also serves as study.
Pattern meaning 'do B together with A'. Often used when combining elements or actions.
併用 (へいよう) is for using two things together (e.g., drugs, methods). 共用 (きょうよう) is for sharing a single thing among multiple people (e.g., kitchen, printer). Do not confuse them.
The English phrase 'combined use' can sound unnatural if directly translated as 結合使用 (けつごうしよう) or 組み合わせ使用. Stick to the natural options above.
The combined use of these two drugs is not recommended.
We have a combined use kitchen in our office.
薬の併用には注意が必要です。
Caution is required when using medications together.
We use this printer jointly within the department.
Please check the previous meeting minutes together with this document.