下馬 is read as げば (geba) and means dismounting.
げば
geba
げばさき
dismounting place
げばひょう
rumor
うまげた
low geta (once used when cleaning the garden)
かりゅう
lower classes
かこう
descent
げしゅく
boarding house
しもはんき
second half of the year
したしらべ
preliminary investigation
げだん
low position (of a sword in kendo, etc.)
かき
the following
したくさ
undergrowth
げらく
depreciation