Definition

1. Noun:
   • Nutgrass (Cyperus rotundus): A type of perennial weed belonging to the sedge family (Cyperaceae), known for its extensive network of underground tubers and rhizomes. It is notoriously difficult to eradicate from fields and gardens.
   • A troublesome or persistent weed: Used metaphorically to refer to something undesirable that is hard to get rid of.

Usage Examples

• Noun:
  • Ruộng lúa này bị nhiều cỏ cú. (This rice field is infested with nutgrass.)
  • Loại cỏ cú này có rễ và củ rất dai. (This nutgrass has very tough roots and tubers.)

Advanced Usage

• "cứng như cỏ cú": (as tough/stubborn as nutgrass) Used to describe a person who is very stubborn or something that is very tenacious and hard to remove.
  • Tính anh ấy cứng như cỏ cú. (His personality is as stubborn as nutgrass.)

Variants and Related Words

• Cỏ gấu: This is a direct synonym for "cỏ cú", referring to the same plant, .
• Cỏ tranh: (cogon grass, ) Another type of tough, invasive grass, often mentioned in similar contexts of persistent weeds.

Synonyms

• Nut sedge: Another common English name for .
• Coco-grass: A less common English name for the same plant.

Related Phrases

• Nhổ cỏ cú: (to pull up nutgrass) Means to eradicate a persistent problem.
  • Chúng tôi phải nhổ cỏ cú trong vườn. (We have to pull up the nutgrass in the garden.)

Related Idioms

• "Cỏ cú mọc đầy đồng": (Nutgrass grows all over the field) Used to describe a situation where a negative or troublesome element has become widespread and pervasive.
  • Nạn tham nhũng như cỏ cú mọc đầy đồng. (Corruption is like nutgrass growing all over the field.)

1. Như cỏ gấu