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
かはんき
second half of the year
したしらべ
preliminary investigation
かだん
low position (of a sword in kendo, etc.)
かき
the following
したぐさ
undergrowth
げらく
depreciation