cram

1 cram /ˈkræm/ verb
crams; crammed; cramming
1 cram
/ˈkræm/
verb
crams; crammed; cramming
Britannica Dictionary definition of CRAM
1 
[+ object] : to fill (something) so that there is no room for anything else : to fill (something) completely
— often used as (be) crammed
2 
[+ object]
a  : to push or force (someone or something) into a space that is tight or crowded — usually + into or in
— see also cram in (below)
b  [no object] : to push or force yourself into a space that is tight or crowded — usually + into
3 
a  [no object] : to prepare for a test, exam, etc., by learning a lot of information quickly — usually + for
b  [+ object] chiefly British : to prepare (someone) for a test, exam, etc., by teaching a lot of information quickly — usually + for

cram in

[phrasal verb]
cram in (someone or something) or cram (someone or something) in
: to make a special effort to meet with (someone) or to do (something) although you are very busy
2 cram /ˈkræm/ noun
plural crams
2 cram
/ˈkræm/
noun
plural crams
Britannica Dictionary definition of CRAM
[count] US
: a quick period of study in order to learn a lot of information quickly for a test, exam, etc. — usually used before another noun
◊ A cram school is a school designed to help students prepare for exams and get into better schools.