The term 'iron out' is a phrase that means to SIMPLIFY, SOLVE, or RESOLVE a problem. The crossword solutions for this phrase are 'SIMPLIFY' (8 letters), 'SOLVE' (5 letters), and 'RESOLVE' (7 letters). All three of these words have similar meanings, but they can be used in different contexts. Simplifying a problem means to make it easier to understand by breaking it down into smaller parts. Solving a problem means to find a solution to the problem. Resolving a problem means to come to an agreement or conclusion about the problem. All three of these words can be used to describe the process of ironing out a problem.