Something dropped.
"The heavy box fell to the floor when I lost my grip."
present participle of drop
"The children are dropping ice cubes into their glasses to cool them down quickly."
In plain English: To drop something means to let it fall from your hand so that it hits the ground below you.
"The teacher had to drop her class because she missed too many exams."
The word dropping is formed by adding the suffix "-ing" to the verb drop. This construction follows standard English grammar rules rather than having a unique historical origin separate from its base form.