bow, nod, condescend
頫 centers on lowering the head or body as a gesture: bowing, nodding, or adopting a condescending posture that looks down on others.
頫 combines 兆 (portent, sign) with 頁 (head). The exact historical development is uncertain, but it likely relates to the head making a gesture or sign.
The left side 兆 suggests a sign or omen, and the right side 頁 is a head. Picture a head bowing low as a sign of respect or condescension.
For フ, imagine a bowing figure making a soft 'foo' sound as they lower their head: foo -> フ.