overplay

overplay /ˌoʊvɚˈpleɪ/ verb
overplays; overplayed; overplaying
overplay
/ˌoʊvɚˈpleɪ/
verb
overplays; overplayed; overplaying
Britannica Dictionary definition of OVERPLAY
[+ object]
1 
: to give too much attention to (something) : to make (something) seem more important than it really is
— opposite underplay
2 
disapproving : to show too much emotion when acting in a play, movie, etc.

overplay your hand

also overplay your cards
: to make a mistake because you believe that your position is stronger or better than it really is