fly - definition and synonyms

noun [countable] 

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  1. 1
    a common small insect with wings. Flies eat food, are often found near rubbish, and are responsible for spreading many diseases

    A trapped fly buzzed against the window pane.

    a swarm/cloud/plague of flies:

    There were clouds of small flies over the river.

     Synonyms and related words
  2. 4
    mainly American the flies on a pair of trousers
     Synonyms and related words