A presage is a sign that something bad is about to happen, like when you get that queasy feeling in your stomach because your mom found out you skipped band practice to go to the movies.
Presage, pronounced "PREH-sige," can be a noun or a verb. As a noun, presage is a warning or omen of bad things to come, like a strange quiet and stillness in the air, presage to the coming tornado. As a verb, presage means "to make a prediction or give a warning of what's to come." A terrible end-of-season football game might presage the struggles that the team will face next season.