The Buddha redefined the term "yañña" (sacrifice), sometimes spelt "yajna" or "yajña".
The Buddha discouraged animal sacrifice, human sacrifice, and other extra extravagant ritualistic sacrifices (soma juice drinking etc.), of which I quoted only part of the sutta of AN 4.39 below.
The Buddha however praised non-violent sacrifices, which I think refers to giving gifts (or contributing necessities) to family members.
So, it looks to me like he redefined this term from animal sacrifice to giving charity, which is also supported by this Pali-English dictionary entry.
A similar teaching is given in SN 3.9.
“Does Master Gotama praise sacrifice (yañña)?”
“Brahmin, I don’t praise all sacrifices. Nor do I criticize all
sacrifices. Take the kind of sacrifice where cattle, goats and sheep,
chickens and pigs, and various kinds of creatures are slaughtered. I
criticize that kind of violent sacrifice. Why is that? Because neither
perfected ones nor those who are on the path to perfection will attend
such a violent sacrifice.
But take the kind of sacrifice where cattle, goats and sheep, chickens
and pigs, and various kinds of creatures are not slaughtered. I praise
that kind of non-violent sacrifice; for example, a regular gift as an
ongoing family sacrifice. Why is that? Because perfected ones and
those who are on the path to perfection will attend such a non-violent
In SN 7.21, the Buddha redefined the ritualistic practice of purification by immersion in water, into purification by immersion in virtues.
In Sigalovada Sutta, the Buddha redefined the practice of prayer directed in six directions.