1
general::
Phrase(s): lock something in
to make something, such as a rate of interest, permanent over a period of time. • You should try to lock in a high percentage rate on your bonds. • We locked in a very low rate on our mortgage., Phrase(s): lock someone or an animal (up) in (something) [and] lock someone or an animal up
to fasten the opening to something so someone, a group, or an animal cannot get out. • Take Chuck and lock him up in the cell. • Lock up the killer and throw away the key!
McGrawhill's American Idioms And Phrasal Verbs
2
general::
1. Enclose, surround, as in The ship was completely locked in ice. [c. 1400s] 2. Also, lock into. Fix firmly in position, commit to something. This phrase often occurs as be locked in or into, as in She felt she was locked in a binding agreement, or Many of the stockholders are locked into their present positions. [Mid-1900s]
American Heritage Idioms