to renounce; to abandon; to give up

The company abandoned that project.

The Japanese people have renounced war.

I don't want to lose my ideas, even though some of them are a bit extreme.

With North Korea's announcement on the 26th of its nuclear development plan based upon the agreement stemming from the Six Party Talks, and the United States' commencement of procedures to remove North Korea from its designation on the list of State Sponsors of Terrorism, the families of abductees have expressed growing unease that it may constitute an abandonment of the abductee issue.

It is time you left off your childish ways.