Translation guide
The English word 'sub' is a broad, informal abbreviation with many meanings. This guide focuses on the most common uses an English-speaking learner might need to express in Japanese, organized by intended meaning.
Referring to a person or thing that takes the place of another, especially in a temporary or secondary role.
General term for a substitute, proxy, or agent. Works for people acting on behalf of others.
He attended the meeting as a sub for his boss.
Very common word for substitute or replacement. Used in daily conversation.
Specifically a substitute player in sports or a替补 member in a group. Common in school club contexts.
A reserve or backup person, often in sports or performance. Implies waiting on standby.
Referring to the underwater vessel.
Referring to the long sandwich, also called sub, hoagie, hero, etc.
In Japan, 'sub' as a sandwich is strongly associated with the chain Subway. Use the brand name or describe it.
Referring to text captions for dialogue, often abbreviated as 'subs'.
Standard word for subtitles. Use 字幕 for 'subs' in the context of movies or videos.
Referring to a recurring payment for a service, often abbreviated as 'sub' online.
Common abbreviation for subscription (from 'subscription'). Widely used for streaming services, etc.
Referring to a person who takes the submissive role in BDSM.
Direct loanword used in BDSM communities. Understandable among those familiar with the scene.
The English abbreviation 'sub' has no single Japanese equivalent. Always choose the word that matches the specific meaning you intend. Using サブ (sabu) for everything will cause confusion.
I want a sub. (ambiguous, could mean submarine, substitute, subscription, etc.)
代理 (dairi) implies a formal, often authorized substitution (e.g., proxy, agent). 代わり (kawari) is broader and more casual, meaning replacement or instead of. For a person acting temporarily, 代理 is better; for a thing used in place of another, 代わり is natural.
I used soy milk as a sub for regular milk.
He's a sub on the soccer team.
控えの選手がウォーミングアップをしている。
The sub players are warming up.
Standard word for submarine. Used in news, military, and general contexts.
The sub entered the harbor.
Loanword from English, often used in casual or brand contexts, but less common than 潜水艦.
That movie features a yellow sub.
I had a sub for lunch.
Descriptive phrase for a long sandwich. Not a fixed term, but understandable.
I ordered a sub for the party.
This movie has English subs.
I canceled my Netflix sub.
Formal term for subscription, often for magazines or newspapers.
I signed up for a magazine sub.
彼女はサブの役割が好きだ。
She enjoys the sub role.
Literally 'passive', can be used to describe a submissive person in relationships, but not specifically BDSM.
He's more of a sub, if anything.