A feminine caesura is a pause in a line of verse that falls after an unstressed syllable. Because the pause comes on a light beat, it can make the line feel less forceful and more conversational than a masculine caesura, which comes after a stressed syllable.
Poets use this kind of pause to vary rhythm, slow the reading, or create a more delicate break in the movement of the line.
Example
The morning, still and pale, / began to wake
before the street had loosened from its sleep.