Compare: 止まる vs 止まる

止まるとまる

to stop (moving); to come to a stop

止まるとどまる

to remain; to abide; to stay (in the one place)

とまる止まる
N5CommonGodan verb (ru ending)

to stop (moving); to come to a stop

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Examples

列車はその駅では(とまる)まりません。

The train doesn't stop at that station.

自転車はキーと音を立てて(とまる)まった。

The bike screeched to a stop.

とどまる止まる
N5CommonGodan verb (ru ending)

to remain; to abide; to stay (in the one place)

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Examples

彼女は独りでここにとどまった。

She stayed here by herself.

彼女は行くかとどまるかを熟考した。

She deliberated over whether to go or stay.