0 the act of offering something (eg an animal that is specially killed) to a god -- das Opfer
A lamb was offered in sacrifice.
1 the thing that is offered in this way -- das Opfer
A slaughtered lamb was offered as a sacrifice.
2 something of value given away or up in order to gain something more important or to benefit another person -- das Opfer
3 to offer as a sacrifice -- opfern
4 to give away etc for the sake of something or someone else -- opfern