途中で | On the Way and Partway Through in Japanese

Two Kinds of Midway

1. Physically en route.

2. Partway through an activity.

Form	Sense
途中(とちゅう)で	something happens midway — the common one
途中(とちゅう)に	something exists along the route

駅(えき)までの途中(とちゅう)に本屋(ほんや)がある — the bookshop is located on the way. で would mean something happened there.

Both cover "in the middle of", and the difference is temperature:

Pattern	Feel
最中(さいちゅう)に	at the peak, and interrupted — usually unwelcome
途中(とちゅう)で	simply partway — neutral

Leaving a meeting 途中(とちゅう)で is just leaving early. Leaving it 最中(さいちゅう)に sounds like you walked out.

まで gives "up to a point, then stopped": 途中(とちゅう)まで読(よ)んだ (I read partway and stopped).

Example Sentences

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Speed

帰(かえ)る途中(とちゅう)で買(か)い物(もの)をしました。

I did some shopping on the way home.

映画(えいが)の途中(とちゅう)で寝(ね)てしまった。

I fell asleep partway through the film.

駅(えき)までの途中(とちゅう)に本屋(ほんや)があります。

There's a bookshop on the way to the station.

会議(かいぎ)の途中(とちゅう)で退席(たいせき)しました。

I left partway through the meeting.

途中(とちゅう)まで読(よ)んで止(や)めました。

I read partway and then stopped.

学校(がっこう)に行(い)く途中(とちゅう)で友達(ともだち)に会(あ)った。

I ran into a friend on the way to school.

工事(こうじ)が途中(とちゅう)で止(と)まっています。

The construction has stopped midway.

話(はなし)の途中(とちゅう)で質問(しつもん)してもいいですか。

May I ask a question partway through?