one clumsy way:
sex:gender::pig:pork
sex:gender::­pig:pork
there’s also
sex꞉gender꞉꞉pig꞉pork
sex꞉gender꞉꞉pig꞉pork
(Unicode ‘MODIFIER LETTER COLON’ U+A789)
or
sex:gender::pig:pork
sex:gender\::`pig:pork`
Not sure if there’s a saner way.
