I believe you just did so.
To cower means to cringe/ shy away from something. ie. "The dog cowered when the door slammed shut".
"Cool it" can refer to either the standard English use (instruction to chill) or the colloquial which indicates that someone should calm down or otherwise refrain from an argument. Example sentences...
Snow in New York City during the summer would be an anomaly.
The guard cried for a piteous appeal for help.