frostbound en · ADJ
Etymology
From frost + bound.
Meanings
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(not-comparable) Bound or confined by frost.
For several weeks—months in some cases—routine track repair work came to a standstill because of the frostbound condition of the formation, or through other circumstances which precluded relaying, drainage and other operations.
1964 April, Warren Smith, “The Midland's accelerated timetable—the first year—II”, in Modern Railways, page 243: