To force or squeeze something into an inadequate space. To study intensively in a short period, especially before an examination.
From Old English 'crammian' meaning 'to stuff, cram full,' related to Old Norse 'kremja' meaning 'to squeeze.' The word has maintained its basic meaning of forceful compression, with the academic sense developing in 19th-century student slang.
The study sense of 'cram' perfectly captures the physical discomfort of trying to force too much information into your brain too quickly - it's literally the same word we use for stuffing too many items in a suitcase. This metaphor reveals how we conceptualize learning as a spatial, physical process.
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