What is the opposite word of introduce?

There isn't a single perfect opposite for "introduce." It depends on the context:

If "introduce" means to bring something or someone new:

* Remove

* Withdraw

* Eliminate

* Discard

* Dismiss

* Leave

If "introduce" means to make someone or something known:

* Conceal

* Hide

* Suppress

* Withhold

* Ignore

If "introduce" means to formally present someone:

* Dismiss

* Ignore

* Overlook

Ultimately, the best opposite for "introduce" will depend on the specific situation and the meaning you want to convey.