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English word bolthole comes from English ditch, English bolt
ditch (English)
A trench; a long, shallow indentation, as for irrigation or drainage. (intransitive) To deliberately crash-land an airplane on water.. (intransitive) To deliberately not attend classes; to play hookey.. (intransitive) To dig ditches.. (transitive) To dig ditches around.. (transitive) To discard or abandon.. (transitive) To throw into a ditch.
bolt (English)
A sieve, especially a long fine sieve used in milling for bolting flour and meal; a bolter. Suddenly; straight; unbendingly. (US, politics) To refuse to support a nomination made by a party or caucus with which one has been connected; to break away from a party.. (intransitive) To escape.. (intransitive) To flee, to depart, to accelerate suddenly.. (intransitive, botany) Of a plant, to grow [...]
bolthole (English)
(figurative) A second home, etc. where a person can go to escape the stresses of everyday life.. A hole in an animal's den, or through a wall or fence, used for escape or emergency exit; i.e. a hole the animal may bolt through.