This is the 5235th most frequent Chinese word.
下马
"下马" means "to dismount" (from a horse).
In this sentence, '下马' means to dismount from a horse.
他下马后走进了酒馆。
After dismounting, he walked into the tavern.
Here, '下马' is metaphorically used to mean the cessation or abandonment of a plan or initiative.
这个计划由于资金问题被迫下马。
This plan was forced to halt due to funding issues.
'下马威' is a set phrase meaning an initial show of authority or strictness.