The play is based on Columbus discovering new land. The crew on the ship is fade up of continuing the voyage as they failed to discover any new land. Columbus is very ambitious about continuing the voyage inspite the reluctance of the sailors. There is a revolt.The sailors go to such extreme that they even plan to get rid of Columbus by killing him. In angry mood one of the sailor says the following statement. (Santa Maria is the name of the ship. )
"The Santa Maria will be the lighter for his carcass. "
Could you please let me know what does the line mean. ?