robber fly: meaning, definition, pronunciation and examples
LowTechnical/Scientific, Nature/Wildlife Enthusiast
Quick answer
What does “robber fly” mean?
A predatory insect of the family Asilidae, known for its speed, robust build, and habit of catching and eating other insects while flying.
Audio
Pronunciation
Definition
Meaning and Definition
A predatory insect of the family Asilidae, known for its speed, robust build, and habit of catching and eating other insects while flying.
Sometimes used metaphorically to describe a person or entity that preys swiftly and opportunistically on others.
Dialectal Variation
British vs American Usage
Differences
The term is identical in spelling and core meaning. Slight variation in common knowledge; more likely known by entomologists and naturalists in both regions.
Connotations
Neutral technical term. No significant cultural connotation differences.
Frequency
Equally low-frequency in general discourse in both varieties. Slightly more prevalent in North American field guides due to greater diversity of species there.
Grammar
How to Use “robber fly” in a Sentence
The [ADJECTIVE] robber fly [VERB] its prey.We observed a robber fly [VERB-ing] a bee.Vocabulary
Collocations
Usage
Meaning in Context
Academic
Used in entomology, zoology, and ecology papers. 'The foraging behavior of the robber fly (Diptera: Asilidae) was studied.'
Everyday
Rare. Might be used in nature documentaries or by gardeners: 'Look at that big fly catching bees—it's a robber fly.'
Technical
Standard term in entomological keys, field guides, and species descriptions.
Vocabulary
Synonyms of “robber fly”
Vocabulary
Antonyms of “robber fly”
Watch out
Common Mistakes When Using “robber fly”
- Confusing it with a 'robber frog' (different animal).
- Using 'robberfly' as one word (standard is two words).
- Assuming all large flies are robber flies.
FAQ
Frequently Asked Questions
No, they are not. Robber flies are beneficial predators of pest insects. They can bite in self-defense if handled, but it is mild and rare.
They are carnivorous, feeding primarily on other flying insects such as flies, bees, wasps, butterflies, and moths.
Look for a stout, hairy body, a prominent 'beard' of bristles on the face, large eyes, and a long, tapering abdomen. They often perch conspicuously and dart out to catch prey.
Yes, 'assassin fly' is a common synonym for robber fly, both referring to insects in the family Asilidae.
A predatory insect of the family Asilidae, known for its speed, robust build, and habit of catching and eating other insects while flying.
Robber fly is usually technical/scientific, nature/wildlife enthusiast in register.
Robber fly: in British English it is pronounced /ˈrɒb.ə ˌflaɪ/, and in American English it is pronounced /ˈrɑː.bɚ ˌflaɪ/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “[Rare/Non-standard] To move like a robber fly: to act with sudden, decisive speed.”
Learning
Memory Aids
Mnemonic
Imagine a fly wearing a robber's mask, swiftly 'stealing' other insects out of the air.
Conceptual Metaphor
NATURE IS A BATTLEFIELD / INSECTS ARE WARRIORS (the robber fly is an aerial ambush predator).
Practice
Quiz
What is the primary characteristic of a robber fly?