To cast generally means to throw, whether forcefully or by letting something fall. It may also mean to form molten metal, reject what is unfit, demolish, reproach, consider, or place anxiety upon another.
Biblical usage includes casting nets or lots, casting reproach, casting down strongholds, casting anxiety upon God, and being cast down without being destroyed. “Castaway” refers to what testing proves rejected, counterfeit, or unfit.
The principal New Testament verb is often compounded with prepositions expressing directions such as away, down, forth, into, out, up, and upon. In some passages the English word translates terms meaning consider, reproach, demolish, or reject.