The phrase suggests an urgent and sudden action often due to fear or danger. Hearing the growl, we took to our heels.
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Figurative Usage
Used metaphorically, not always implying literal running. At the surprise inspection, the workers took to their heels.
Pro Tip 3/3
Informal Expression
It's an informal phrase, often inappropriate in formal writing or speech. In formal situations, instead of saying 'He took to his heels,' say 'He left abruptly.'