* Palindrome refers to a word or phrase that reads the same backward as forward (e.g., racecar, level).
* Blowing a horn is the action of creating a sound by using a horn.
There isn't a single word that perfectly captures the meaning of blowing a horn, but you could use terms like:
* Tooting
* Honking
* Sounding
* Blaring
* Trumpeting
The specific word you choose would depend on the context and the type of horn being blown.