牙套
a device fitted to something, in particular a weak or injured part of the body, to give support.
a pair of straps that pass over the shoulders and fasten to the waistband of a pair of trousers or a skirt at the front and back to hold it up; suspenders.
make (a structure) stronger or firmer with wood, iron, or other forms of support.
prepare (oneself) for something difficult or unpleasant.