al·tar 
/ˈɑ:ltɚ/ noun
plural al·tars /ˈɑ:ltɚ/ noun [count] 1 : a raised place on which sacrifices and gifts are offered in some religions — sometimes used figuratively ▪ She sacrificed honesty on the altar of success. [=she chose to be dishonest in order to achieve success] 2 : a platform or table used as a center of worship in Christian ceremonies and services
led to the altar
◊If you are led to the altar, you get married.
▪ They started a romance that eventually led (them) to the altar.
▪ They started a romance that eventually led (them) to the altar.
left at the altar
◊If you are left at the altar, you do not get married because the person you were going to marry has decided against it at the last moment.
▪ Her fiancé left her at the altar.
▪ Her fiancé left her at the altar.
