reins /ɹeɪnz/noun 4phrases 1 noun4 •The lower part of the back. •The loins. •The parts of a vault between the crown and the spring or abutment, including, and having especial reference to, the loading or filling behind the shell of the vault. •(no longer used) The kidneys. Phrases with reins hold the reinsTo be in charge, to be in control, as of a business, political organization, or other group.
