ハク, バク, ぐれ, と, はか, ひろ
Dr., command, esteem, win acclaim, Ph.D., exposition, fair
JLPT1 G4 S12 F794
尃# combines 甫 (spread) + 寸 hand/action indicator → spread in announcing/proclaiming. 博 adds 十 (gather) → a collection of numerous objects, spread over a surface → *broad*; *expansive*; *extensive* → *gambling* (← spread out objects being gambled) → *hit the mark*.
[Full Kanji Etymology List]