A kitchen utensil used for mashing food such as potatoes. She used a masher to prepare the mashed potatoes for dinner.
A man who makes unwelcome advances to women. In the 19th century, a 'masher' was often a man who would flirt aggressively with women.
A machine or device used for mashing substances, especially grains in brewing. The brewery's new masher can process hundreds of kilograms of grain per hour.
Slang. A person who rapidly and repeatedly presses buttons on a video-game controller, often without strategy. He's a notorious masher who wins by sheer speed rather than skill.