stag 
/ˈstæg/ noun
plural stags or stag /ˈstæg/ noun [count] : an adult male deer
go stag
US : to go to a party or other social event by yourself
▪ He's going stag [=going alone] to the party. — see also stag party
▪ He's going stag [=going alone] to the party. — see also stag party
