1 C1 慣用的 フォーマル
自分の時間・努力・感情のエネルギーを、他の人を助けるために惜しみなく無私にささげる。
"She has spent decades giving of herself to care for the elderly in her community."
“
Ask not what your country can do for you — ask what you can do for your country.
— John F. Kennedy, Inaugural Address, 1961 (expresses the same spirit as 'give of oneself')