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running at full speed; going as fast as one can go
子供たちは一目散に走った。
The children ran at full speed.
飼い主を見つけ、犬は一目散に駆けた。
Spotting its owner, the dog dashed at full speed.
泥棒は財布を奪い、一目散に逃げ去った。
The thief snatched the purse and fled at full speed.