разгуливать(о диких животных • There is a very curious sequel to Abbott's encounter: two days later, she was visited at her home by a government official who, while the pair sat and drank cups of tea, advised her, in fairly relaxed tones, not to talk about the experience. (...) If true, it suggests that elements of the British Government may wish to keep exceedingly quiet the fact that wild animals are on the loose in the heart of London's old tunnels.mysteriousuniverse.orgART Vancouver)
thefreedictionary.com Alexander Oshis); на воле (нужно понимать разницу между лицами, освобождёнными по истечении срока наказания, и теми, кто находится на свободе незаконно, именно к ним и относится идиома on the loose ART Vancouver); на свободе; не пойман (Tanya Gesse); в загуле; в разгуле