# flies

/ˈfɫaɪz/ (US) · /flˈaɪz/ (UK)

Source: https://englishreference.com/word/flies
Updated: 2026-06-19

## Senses

### 1. insects

noun · CEFR A2

more than one fly (the small insect with two wings).

For teachers: the plural form of the common dipterous insect.

- There were several flies buzzing around the fruit bowl in the kitchen.
- The biologist observed how the flies were attracted to the decaying organic matter at the edge of the pond.

### 2. trouser opening

noun · CEFR B2 · British English

the opening at the front of a pair of trousers, usually closed with a zip or buttons.

For teachers: an opening at the crotch of a pair of trousers, typically fastened with a slide fastener or buttons.

- He checked his flies in the mirror before walking onto the stage.
- The tailor ensured the flies were perfectly aligned with the waistband to maintain the garment's sharp silhouette.

Usage: Often used in the singular 'fly' in American English, while 'flies' is common in British English.

### 3. theatre equipment

noun · CEFR C2 · Technical

the space above a theatre stage where lights and scenery are kept.

For teachers: the area above a stage where scenery, curtains, and lighting equipment are suspended and manipulated.

- The crew lowered the heavy painted backdrop from the flies.
- From the flies, the stagehands had a bird's-eye view of the actors as the mechanical rigging began to descend for the final act.

## Examples

- Several flies are buzzing around the kitchen window.
- We had to cover the food during the picnic to keep the flies away.
- The rapid movement of flies makes them difficult to catch, as their compound eyes allow them to detect even the slightest changes in light and motion.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.