1. Don't halloo till you are out of the wood.
2. Do not halloo till [until] you are out of the wood(s).
3. Do not halloo till you are out of the wood.
4. Do not halloo until you are out of the woods.
5. He gave a great halloo but no one heard him.
6. That in turn is related to halloo, a cry to urge on hunting dogs.
7. Don't halloo [ cry ] till you are out of the wood.