"Try for size" is an idiom that means to test something out, often to see if it fits or suits a particular purpose. Antonyms for this phrase may include "disregard," "ignore," "dismiss," or "neglect." These words imply a lack of interest or effort in trying out something new or testing its suitability. Alternatively, antonyms for "try for size" could include "improvise," "make-do," or "settle." These words suggest finding alternative solutions or making the best of a situation rather than investing time and effort in trying to find the perfect fit.