For through the Law [customs] I [Apostle Paul] died to the Law, so that I might live to God. {20} I have been crucified with Christ [the Anointed One]; and it is no longer I who live, but Christ lives in me; and the life which I now live in the flesh [body] I live by faith in the Son of God [Jesus Christ], who loved me and gave [deliver something to another to keep] Himself up for me.
New American Standard Bible

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One way that we have been crucified with Christ is by relationship: we have become one with Christ, and His experiences are ours.  Our Christian life began when, in unity with Him, we died to our old life.  In our daily life, we must regularly crucify sinful desires that keep us from following Christ.  This, too, is a kind of dying with Him.