満タン（まんタン、mantan）
- full tank

満タン満タン means "full tank" or "filled up" and is typically used in the context of vehicles, such as cars and motorcycles, to describe a fuel tank that is completely filled with gasoline or other fuel. It can also be used metaphorically to describe something that is completely full in another context, such as a container of water or a person's energy level.

⚫︎ガソリン、満タンでお願いします。 Translation: "Fill it up with gasoline, please." ⚫︎車のタンクは満タンでした。 Translation: "The car's tank was full." ⚫︎今日の疲れは満タンだ。 Translation: "I'm completely exhausted today."

⚫︎This word is primarily used in casual conversation and everyday situations. ⚫︎It’s common to use it when asking a gas station attendant to fill up your car or when describing the state of a fuel tank. ⚫︎It can also be used to express that something is completely full, even if it is not a literal tank.

⚫︎The word is most commonly written in katakana: 満タン. ⚫︎It's a loanword derived from English, so the use of katakana is standard. ⚫︎While it’s possible to write 満 (man, meaning "full") in kanji, and then タン in katakana, it's rarely done.

⚫︎一杯 (いっぱい) (ippai): "Full" – this is a more general term that can be used in many contexts. ⚫︎満杯 (まんぱい) (manpai): "Full to capacity." This term can be used for vessels and containers.

⚫︎空 (から) (kara): "Empty." ⚫︎少ない (すくない) (sukunai): "Few, little." ⚫︎半分 (はんぶん) (hanbun): "Half."

ガソリンスタンドで、満タンにしてくださいと頼みました。 ・Translation: At the gas station, I asked them to fill it up. ・Explanation: This sentence demonstrates the common use of 満タン when at a gas station.

あのバケツは水で満タンだ。 ・Translation: That bucket is full of water. ・Explanation: This sentence uses 満タン to describe a container filled with liquid.

⚫︎満タン is a loanword. It originates from the English phrase "full tank." ⚫︎It's a direct borrowing, and therefore its meaning directly corresponds to the English expression.