Translation guide
Expresses mutual or two-way action, feeling, or relationship. Japanese uses adverbs, verbs with 'each other', or compound verbs.
Describing an action or feeling that two or more people do to or feel for each other.
Adverb meaning 'mutually' or 'each other'. Used with verbs to show reciprocal action. Common and natural.
We helped each other.
They gave each other presents.
Compound verb suffix meaning 'do mutually'. Attach to the stem of a verb. Very common for reciprocal actions.
to discuss (talk mutually)
to love each other
to help each other
Formal adverb meaning 'mutually' or 'reciprocally'. Used in written or formal contexts.
The two countries cooperate reciprocally.
Similar to お互いに but slightly more formal or literary. Still common.
It's important to trust each other.
Describing a relationship, agreement, or arrangement that is two-way or mutual.
Expressing 'each other' or 'one another' in a sentence.
お互い can function as a noun meaning 'each other'. Often used with particles like を, に, の.
Respect each other.
Listen to each other's opinions.
お互いに is an adverb used with a verb, while 〜合う is a verb suffix. Both express reciprocity, but 〜合う often implies a more integrated action. For example, 話し合う (to discuss) is more natural than お互いに話す for 'discuss'. Use お互いに when you want to emphasize the mutual aspect explicitly.
Both mean 'help each other', but 助け合う is more common and natural.
English 'reciprocally' is often translated directly as 相互に, but this can sound stiff or technical. In everyday conversation, use お互いに or 〜合う instead.