"uppers" in the noun sense

1. upper berth, upper

the higher of two berths

2. upper

piece of leather or synthetic material that forms the part of a shoe or boot above the sole that encases the foot

"Uppers come in many styles"

3. amphetamine, pep pill, upper, speed

a central nervous system stimulant that increases energy and decreases appetite used to treat narcolepsy and some forms of depression

Source: WordNet® (An amazing lexical database of English)

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