名詞 tumbleweed:

1. any plant that breaks away from its roots in autumn and is driven by the wind as a light rolling mass
2. prickly bushy Eurasian plant; a troublesome weed in central and western United States
   同義詞：Russian thistle, Russian tumbleweed, Russian cactus, Salsola kali tenuifolia
3. bushy annual weed of central North America having greenish flowers and winged seeds
   同義詞：winged pigweed, Cycloloma atriplicifolium
4. bushy plant of western United States
   同義詞：Amaranthus albus, Amaranthus graecizans