Question

hint: cause
another hint im not sure
the child swallowed a household cleaner, so the poison control center told us to i______, or to cause, vomiting.

Explanation:

The sentence structure and context suggest that we are looking for a verb that means "to cause vomiting". The prefix "i - " is a hint. The word "induce" means to bring about or cause something, which fits well in the context of causing vomiting.

Answer:

induce