1.
If a part of your body is ~, it is completely still but ready to move at any moment.
He studied the keyboard carefully, one finger ~.
ADJ
2.
If someone is ~ to do something, they are ready to take action at any moment.
Britain was ~ to fly medical staff to the country at short notice...
US forces are ~ for a massive air, land and sea assault.
ADJ: v-link ADJ, usu ADJ to-inf, ADJ for n
3.
If you are ~, you are calm, dignified, and self-controlled.
Rachel appeared ~ and calm.
ADJ: usu v-link ADJ