honour
do the honours
1 perform a social duty or small ceremony for others.
2 perform a particular function that is central to the proceedings. informal humorous
❷2007David KynastonA World to Build Two men were hanged at Pentonville, with the lugubrious Albert Pierrepoint doing the honours.
honours are even there is equality in the contest. British
(in) honour bound obliged by your sense of honour.
Scout's honour: seeScout.