1.
If something is put on a particular ~, it is defined, established, or changed in a particular way, often so that it is able to develop or exist successfully.
The new law will put official corruption on the same legal ~ as treason.
= basis
N-UNCOUNT: with supp, usu on N
2.
If you are on a particular kind of ~ with someone, you have that kind of relationship with them.
They decided to put their relationship on a more formal ~...
They are now trying to compete on an equal ~.
= basis
N-UNCOUNT: with supp, usu on N
3.
If a country or armed force is on a war ~, it is ready to fight a war.
The president placed the republic on a war ~.
PHRASE: v-link PHR, PHR after v
4.
You refer to your ~ when you are referring to your position and how securely your feet are placed on the ground. For example, if you lose your ~, your feet slip and you fall.
He was cautious of his ~, wary of the edge...
He lost his ~ and slid into the water.
N-UNCOUNT: poss N