rain barrel
US /ˈreɪn ˌbær.əl/
UK /ˈreɪn ˌbær.əl/
1.
a barrel used to collect and store rainwater, typically from a downspout, for later use in gardening or other non-potable applications
:
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She installed a rain barrel to collect water for her garden.
•
Empty the rain barrel before winter to prevent freezing.