hang on to (someone or something) like grim death
To clutch someone or something very tightly, usually to avoid falling. After the ladder tipped over, I hung on to the roof like grim death so that I didn't fall. When my foot slipped, I found myself hanging on to the edge of the cliff like grim death. Small animals and bits of vegetation hang on to even the sheerest of cliff faces like grim death.
hold on to (someone or something) like grim death
To clutch someone or something very tightly, usually to avoid falling. After the ladder tipped over, I held on to the roof like grim death so that I didn't fall. The hiker had to hold on to a root like grim death while she waited for the rescue crew. When the dentist motioned us back into the examination room, my daughter held on to me like grim death.
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