To be exposed to the night air or evening dew. It refers to leaving laundry outside past sunset, which causes the clothes to become damp and prevents them from drying. (The sereno is the cool, humid air that settles at nightfall).
We have to put away Dieguito's shirt, or else it will DAR EL SERENO and it won't dry.
The cool, damp night air that falls after sunset. According to local folk belief, it is thought to cause illness in adults and is especially dangerous for babies if their soft spot, or fontanelle, is not covered. Older generations believe exposure can cause babies to fall suddenly ill (a widespread superstition in the Caribbean regarding the harmful effects of night air).
Don't go out at this hour, you are going to get sick from catching the sereno.
1. The cool, damp night air or evening dew, traditionally believed to cause or worsen illnesses like the cold or flu. 2. A night watchman or security guard who patrols a residential area after dark.
Kid, you are not going anywhere with the sereno out there, no way.