"forward not working? Try reverse!".

And sometimes, when you need to rock back and forth to get going, "modulate the beam!"

Is it like rolling a bit the batteries of the TV remote when it starts to fail?

Shut up and eject the warp core!

You reverse the polarity, just briefly, to blow all of the space dust out of the filters and improve your airflow to get you running in a pinch. You might have to do it more than once, and you definitely have to do a proper space dust filter change at the next starbase, but in an emergency, this should get you up and running.

crawls back into the Jeffries tube

Reverse the polarity of the neutron flow

He means you other guys. Not me. I know why we reverse the polarity. I just don't want to tell you because it's been classified above the Omega Directive.

How else can you attract polar bear engineers

Unplugs the cord, rotates it, plugs it back in.

But what about the tachyon pulse!!

I keep my polarity in a superposition.

its reverse the polarity, or inverse whatever beam weapon they ar using.

I think it's Picard who doesn't know.

It's such a standard procedure that there's no need for the commanding officer to know the details.

During Red Alert, the walking attraction for Universal Studios: Fan Fest Nights, the warp core brings to have issues. You see plasma exhaust and the two crewmen in Engineering yell “reverse the polarity”.