Perpend this

perpend / per-PEND

verb:
1. To ponder; deliberate.
2. To be attentive; reflect.
noun:
1. A large stone passing through the entire thickness of a wall.

While perpend as a noun means "a large stone passing through the entire thickness of a wall" (related to perpendicular), the verb form not only possesses a different pronunciation but also emerges independently from the Latin root perpendere, "to weigh carefully."

Perpend stone or bond stone is a building term used by stonemasons. Usually walls were built with two layers of stone, an inner and an outer layer, with the space between them sometimes filled with rubble. A perpend stone was a longer stone which went right through the wall, from outside to inside, and served to lock the two layers together. It's called a "tie stone" in the illustration.