subduct

verb3

1. •
   To push under or below.

   • The upper tectonic plate had been subducting the lower one for millions of years by the time the eruption happened.
2. •
   To move downwards underneath something.

   • This tectonic plate had been subducting for millions of years by the time the eruption happened.
3. •
   To remove; to deduct; to take away; to disregard.

   • He wished to subduct the caveat that he had entered earlier.