Verb

(protrud)

To extend from, above or beyond a surface or boundary; to bulge outward; to stick out.

*

Archegonia are surrounded early in their development by the juvenile perianth, through the slender beak of which the elongated neck of the fertilized archegonium protrudes .

To thrust forward; to drive or force along.

(John Locke)

To thrust out, as through a narrow orifice or from confinement; to cause to come forth.

* Thomson

When Spring protrudes the bursting gems.

Verb

(penetrat)

To enter into; to make way into the interior of; to pierce.

Light penetrates darkness.

* {{quote-book, year=1879, title=The Telephone, the Microphone and the Phonograph

, author=Th Du Moncel, page=166, publisher=Harper , passage=He takes the prepared charcoal used by artists, brings it to a white heat, and suddenly plunges it in a bath of mercury, of which the globules instantly penetrate the pores of charcoal, and may be said to metallize it.}}

(figuratively) To achieve understanding of, despite some obstacle; to comprehend; to understand.

I could not penetrate Burke's opaque rhetoric.

* Ray

things which here were too subtile for us to penetrate

To affect profoundly through the senses or feelings; to move deeply.

to penetrate one's heart with pity

* M. Arnold

The translator of Homer should penetrate himself with a sense of the plainness and directness of Homer's style.

(Shakespeare)

To infiltrate an enemy to gather intelligence.

To insert the penis into an opening, such as a vagina or anus. (rfex)