vt ·see roust, ·vt.
2. roost ·noun roast.
3. roost ·noun a collection of fowls roosting together.
4. roost ·noun the pole or other support on which fowls rest at night; a perch.
5. roost ·vi to sit, rest, or sleep, as fowls on a pole, limb of a tree, ·etc.; to perch.
6. roost ·vi fig.; to lodge; to rest; to sleep.