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Related to cram in: rub off, turn up, put on the spot, on the back burner, pick up on, cut some slack
1. To shove someone or something into something else (which often cannot contain or accommodate it). A noun or pronoun can be used between "cram" and "in." I tried to cram in another jacket, but it just wouldn't fit in my suitcase. Come on, we can cram you in too—make room, kids!
2. By extension, to force one to retain some information, especially large amount over a short space of time. A noun or pronoun can be used between "cram" and "in." I've been trying to cram this last chapter in for an hour, but my brain is totally fried. Don't just cram in these formulas, or you'll never remember them after the test.
See also: cram