Stai fresco

Wait and hope. Stay fresh, so you will have a high level of conservation given the low temperatures, so you will last longer, so you can also wait longer. Sometimes it also indicates a certain amount of disillusionment related to something that perhaps will never occur …
Eg “Are you waiting for Giangiuseppa?” “Then stay cool!”. (Giangiuseppa is a latecomer note …)