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Kotomora
JLPT N1Spoken and writtenBy accident

た拍ひょう子しに・た弾はずみにin the act of; with the jolt of

One sudden movement sets off something nobody meant to happen: you stand up and a cup goes over, you trip and your glasses fly off.

How to form it

Verb in the た-form + 拍ひょう子しに / 弾はずみに・弾はずみで

転ころんだ拍ひょう子しに, 転ころんだ弾はずみで. 拍ひょう子し is the chance moment and 弾はずみ the momentum; after a sudden movement, either will do.

Before it
Mostly a sudden movement: 立たち上あがった, 転ころんだ, 振ふり向むいた, ぶつかった, くしゃみをした.
After it
What it set off, never something you chose: a thing falls, breaks or comes off, you hurt yourself, a memory comes back.
Where you'll meet it
Conversation and writing alike, wherever someone explains how an accident happened.

In use

Two things to know

The first thing sets off the second

Not said: 立たち上あがった拍ひょう子しに、電でん話わが鳴なった。

(The phone rang just as I stood up.)

Standing up doesn't make a phone ring: 立たち上あがったとたん.

何なにかの拍ひょう子しに, ものの弾はずみで

Two set phrases with a noun in front. 何なにかの拍ひょう子しに is "at some odd moment, for no clear reason". ものの弾はずみで is "on the spur of the moment", for what you said or did without thinking.

Close neighbours

たとたん(に)N3

The very moment one thing was done, something else happened. Nothing says the first caused it.

をきっかけにN2

What started something that lasted: an interest, a habit, a quarrel. Not a slip or a spill.

Check yourself

1Which one fits?

家いえに(  )、雨あめが降ふり出だした。

Choose an answer to see why.

2Which ending fits?

転ころんだ拍ひょう子しに、(  )。

Choose an answer to see why.

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