"being full to the brim," 1660s, present-participle adjective from brim (v.).
"to fill to the brim," 1610s, from brim (n.). The intransitive sense of "be full to the brim" is attested from 1818. To brim over "overflow" is from 1825. Related: Brimmed; brimming.
updated on August 05, 2017