From Longman Dictionary of Contemporary Englisha firm grip/hold/grasp etca firm grip/hold/grasp etcTIGHTif you have something in a firm grip etc, you are holding it tightly and strongly He took a firm grip of my arm and marched me towards the door. a firm handshake → firm
Examples from the Corpus
a firm grip/hold/grasp etc• As soon as one does so, its lips close around it, giving it a firm hold.• But at current levels the shares are a firm hold.• Clumps of sturdy weed grew wherever they could take a firm hold.• Usually this happens because the task is too broadly stated to get a firm grasp on it.• I keep a firm grip on my hat and stare into the blustery abyss.• As darkness gains a firmer grip the songbirds fade and the owls start.• It's safe but you need to have a firm grip to cut a 13-amp flex.• Choose a firm hold variant which will keep your style in place during winder weather and light drizzle. 