Cushion

cush‧ion1 S3 [countable]{noun}

1DH a cloth bag filled with soft material that you put on a chair or the floor to make it more comfortable [↪ pillow]:

a velvet cushion

a cushion cover

2 something that stops one thing from hitting another thing:

Good sports shoes should provide a cushion when running.

3 [usually singular] something, especially money, that prevents you from being immediately affected by a bad situation

cushion against

Savings can act as a cushion against unemployment.

4DGO the soft rubber edge of the table used for playing billiards or snooker