catch (a)hold of (someone or something)
To grasp or grip something. Catch hold of that end of the sheet and pull it straight. I tried to catch ahold of her before she fell off the step, but it happened too fast.
catch (a)hold of someone or something
to grasp or seize someone or something. See if you can catch hold of the rope as it swings back and forth. I couldn't catch ahold of her.
catch/get/grab/take (a) ˈhold of somebody/something
have or take somebody/something in your hands: He caught hold of her wrists so she couldn’t get away.Lee got hold of the dog by its collar.Quick, grab a hold of that rope.