A vessel, vat, or cistern in which things are steeped.(noun)
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Use "steeper" in a sentence
"The avalanche scale suggests that, when the danger is "moderate", caution should be used in steeper terrain."
"For eight of the last 10 years, the decline in revenue from record sales has gotten steeper, which is to say the business is imploding with increasing vigor."
"Pour over this boiling water until the steeper is a little more than half full; cover tightly and let it stand where it will keep hot, but not to boil."