Meaning of “mount” - Learner’s Dictionary

mount

verb uk us /maʊnt/
mount a campaign/challenge/protest, etc
INCREASE [ I ]

to increase in amount or level:

Tension in the room was mounting.
mounting problems
mount sth on/to, etc

to fix an object onto something:

They've mounted a camera on the wall by the door.
GO UP [ T ]

to go up something:

to mount the stairs
RIDE [ T ]

to get on a horse or bicycle

→ Opposite dismount

(Definition of “mount verb” from the Cambridge Learner’s Dictionary © Cambridge University Press)