The term 'fall back on' can be defined as relying on something or someone in a time of need. This phrase can be broken down into three crossword solutions: RELY (4 letters), RESORT (6 letters), and resortto (8 letters). RELY is an intransitive verb meaning to depend on someone or something for aid or support. RESORT is a noun meaning a place to which one frequently goes for relaxation or recreation. Resortto is a verb meaning to have recourse to, or to turn to something for help or support. Together, these three words provide a comprehensive definition of the phrase 'fall back on'.