How can a prepositional phrase shift to become a verb?
I don't know why, but the embolded semantic shift for agree (v.) below unsettles me.
a gré is a prepositional phrase, correct?
If so, how can a prepositional phrase transmogrify into a verb (e.g. agreer)? Can you please make this shift feel more intuitive, or naturalize this shift?
late 14c., "to give consent, assent,"
from Old French agreer "to please, satisfy; to receive with favor, take pleasure in" (12c.), a contraction of phrase a gré "favorably, of good will," literally "to (one's) liking"
(or a like contraction in Medieval Latin) from a,
from Latin ad "to" (see ad-) + Old French gre, gret "that which pleases,"
from Latin gratum, neuter of gratus "pleasing, welcome, agreeable"
(from suffixed form of PIE root *gwere- (2) "to favor").
In Middle English also "to please, gratify, satisfy," a sense preserved in_ agreeable_. Of parties, "come to agreement; make a settlement," mid-15c.; meaning "to be in harmony in opinions" is from late 15c. Of things, "to coincide," from 1520s. To agree to differ is from 1785 (also agree to disagree, 1792).