ice
1 break the ice begin, initiate the proceedings, kick off (informal) lead the way, make a start, start or set the ball rolling (informal) take the plunge (informal)
2 on thin ice at risk, in jeopardy, open to attack, out on a limb, sticking one's neck out (informal) unsafe, vulnerable
ice-cold
arctic, biting, bitter, chilled to the bone or marrow, freezing, frozen, glacial, icy, raw, refrigerated, shivering