To succeed in dealing with a difficult problem. Dating from the mid-twentieth century, this slangy Americanism alludes to coping with a cumbersome object by attaching a handle to it. However, “handle” has been used both figuratively and literally in several ways for many years. “Most things have two Handles; and a wise Man takes hold of the best,” wrote Thomas Fuller in
Gnomologia (1732). Further, “handle” has been a colloquialism for a title, and by extension a name, since about 1800. The current saying, on its way to becoming a cliché, thus can allude either to getting a secure hold on a slippery problem, or to identifying it correctly by naming it. A synonym for the former sense is
get a grip on something, meaning to take a firm hold on it. See also
get a grip.