What does 'In Adams fall we sinned all' mean?

One thought:

Romans 5:12 tells us that through one man, sin entered into the world, and death through sin, thus death spread to all men because they had all sinned.

Because of Adam's sin, he was no longer perfect, so all his children would be born imperfect, subject to sin and death (Romans 3:23). Jesus came to reverse this situation, 'buy us back' and pay the price for that sin(Romans 3:24-25), a perfect ransom, 'eye for an eye, tooth for tooth...'(Exodus 21:24) , "son of God' for "son of God"(Matthew 16:16)(Luke 3:38), (faithful)perfectman, for an(unfaithful)perfect man. (Romans 6:23; 1Corinthians 15:22, 45, 47).

Another Answer: It is still possible to correct Adams sinful act. God has told Adam n0t pick Apple from tree because tree has life and feeling like human, wait for God will bring Apple down with his desire. If we are Hungary God will know it first. For our food or need to hurt (even tree ). Best non violence message on earth. There is one person 110 years ago prove this and become Creator himself. (GOD )