1
general::
Phrase(s): commit something to memory
to memorize something. • Do we have to commit this poem to memory? • The dress rehearsal of the play is tomorrow night. Please make sure you have committed all your lines to memory by that time.
McGrawhill's American Idioms And Phrasal Verbs
2
general::
Learn by heart, memorize, as in The director insisted that the altos commit their part to memory by Tuesday. First recorded in 1875, this phrase today is often replaced by the shorter memorize.
American Heritage Idioms