1. a large fly that bites horses, cattle, and other animals, including humans

Examples

• The horsefly bit the horse on its flank, causing it to kick.
• We had to use insect repellent to keep the horseflies away during our picnic.
• The large horsefly buzzed loudly around the barn.
• Horseflies are particularly active on hot summer days.
• The painful bite from a horsefly left a red welt on my arm.
• Farmers often struggle with horseflies bothering their livestock.