Poetise means to write poetry or to express something in a deliberately poetic way. It can also mean to give language, an image, or an ordinary subject a more lyrical, imaginative quality.
The spelling poetize is common in American English.
Example
He poetised the small details of morning:
steam above the cup,
a sparrow on the sill,
the street waking one window at a time.
Related Definitions
[v] compose verses or put into verse; "He versified the ancient saga"