The phrase "caught flies" refers to capturing small insects commonly found buzzing around our homes. Antonyms for this phrase may include releasing, freeing, or setting them free. This indicates that there is a sense of liberation associated with the opposite of "caught flies." Other possible antonyms for this phrase could involve preventative measures that discourage the insects from entering a space in the first place, such as sealing windows or using repellents. Emphasis on creating an environment that is inhospitable to flies can help avoid the need to deal with them altogether. In summary, antonyms for "caught flies" imply freedom, release, or prevention.