お互い（おたがい、otagai）
- each other

The Japanese word お互い (otagai) means "each other," "mutually," or "one another." It indicates a reciprocal action or relationship between two or more people or things. It emphasizes that something is done by both sides or affects both parties involved. It conveys the idea of shared experience, understanding, or feeling.

⚫︎私たちはお互いを助け合います。 Translation: We help each other. ⚫︎彼らはお互い》の意見を尊重します。 Translation: They respect each other's opinions. ⚫︎お互い様、これからもどうぞよろしくお願いいたします。 Translation: Thank you (to both of us), and please be good to each other in the future. (This is a more formal and polite way of saying "Nice to meet you" and "Let's work together.")

⚫︎お互い is used when referring to actions or feelings that are shared or exchanged between two or more subjects. ⚫︎It's common to use お互い with verbs that describe mutual actions like helping (助け合うtasuke au), respecting (尊重し合うsonkei shiau), understanding (理解し合うrikai shiau), or liking (好き合うsuki au). ⚫︎It can be placed before or after the subject depending on the sentence structure, though it usually goes before the verb. ⚫︎It can be used in both formal and informal conversations, but the level of politeness is usually reflected in the rest of the sentence. ⚫︎The phrase お互い様 (otagai sama) is a fixed expression implying reciprocity or mutual benefit, or something both parties share, can be used to acknowledge similarities or common experiences, or to respond with understanding when another person is in a difficult situation.

⚫︎お互い is usually written in hiragana: お互い. ⚫︎The kanji form is 互い. The "お" is sometimes omitted, especially in written Japanese. ⚫︎The okurigana (the hiragana following the kanji) doesn't change. ⚫︎The pronunciation remains the same whether written in hiragana or kanji. ⚫︎The kanji 互 (tagai) means "each other" or "mutual."

⚫︎相互に (sōgo ni) - mutually, reciprocally (more formal) ⚫︎互いに (tagai ni) - each other, mutually (a bit more common in written Japanese than お互い).

There are no direct antonyms for お互い. The concept it represents is about shared experience, so opposites would express something done in isolation or affecting only one party. Words like "alone" (一人でhitori de) or "separately" (別々にbetsubetsu ni) could be considered related, but not direct antonyms.

私たちは困難な時期をお互いに支え合いました。 ・Translation: We supported each other during difficult times. ・Explanation: This sentence shows the mutual support between the subjects ("we") during a challenging period.

彼らはお互いの夢を応援し合っています。 ・Translation: They support each other's dreams. ・Explanation: This sentence illustrates the shared encouragement and support given by the subjects to each other's ambitions.

⚫︎The word お互い is composed of お, a prefix expressing respect and politeness and 互い. ⚫︎The kanji 互 (tagai) means "each other," "mutual," or "reciprocal." ⚫︎The origin of the word comes from the concept of "two parties" or "two sides" doing something in relation to each other.