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permaculture
permafrost
permanence
permanent
permanent hardness
permanent health insurance
permanent-income hypothesis
permanent-income savings motive
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perk up

perk up


transitive and intransitive verb 
Definition:
 
1. make or become lively: to become more cheerful, positive, or active, or make somebody more cheerful, positive, or active

2. stick up: to stick up, or make something stick up, especially quickly
The dog's ears perked up.

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