late afternoon
晡 centers on the late afternoon, the time of day when the sun is still up but the day is winding down.
晡 combines 日 (sun) with 甫, which likely contributes the sound. The character expresses the late afternoon period when the sun is still visible.
The sun 日 is still out, but the right side 甫 looks like a hand holding a tool, suggesting the day's work is nearly done. Picture the sun low in the sky during the late afternoon.
For ホ, imagine the sun in the late afternoon casting a warm, hollow glow: hollow -> ホ, and the day feels hollow as it winds down.