mat /ˈmæt/ noun
plural mats
plural mats
Learner's definition of MAT
: a small piece of material used to cover the floor or ground
see also bath mat, welcome mat
: a small piece of material used to protect the surface of a table see also place mat, table mat
: a thick pad that is used as a soft surface for some activities (such as wrestling, gymnastics, yoga, etc.)
: a thick mass of something that is stuck or twisted together usually + of

go to the mat

chiefly US, informal
: to make a lot of effort to do something : to try very hard at something