lay hold of
lay hold of {v. phr.}
1. To take hold of; grasp; grab.
He laid hold of the rope and pulled the boat ashore.
2. To get possession of.
He sold every washing machine he could lay hold of.
3. {Chiefly British}
To understand.
Some ideas in this science book are hard to lay hold of.
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Source: A Dictionary of American Idioms