The term MEASURE UP TO can be defined as to be as good as or EQUAL to someone or something else. This is demonstrated by the two crossword solutions, RIVAL and EQUAL, both of which have five letters. RIVAL implies that there is someone or something to compete with, while EQUAL implies that the two are on the same level. Together, these two words demonstrate that the term MEASURE UP TO means to be as good as or EQUAL to someone or something else.