What does it mean to "grab a hold"? There is a song by Cyndi Lauper that says
If you wanna grab a hold, let it go...
The phrase is actually "grab ahold", and when you grab ahold of something, you grasp it or hold onto it.
For example, if you are watching a scary movie with someone, you might grab ahold of their arm during the frightening parts.
Note: The term get a hold of somebody/something has a different meaning.