Abarim Publications' online Biblical Hebrew Dictionary
There are two roots מוש (mush), one of which is a by form of משש (mashash):
The verb מוש (mush I), which is also spelled מיש (mish), means to depart or remove. It occurs about twenty times in the Old Testament, and appears typically employed to describe situations in which something is not removed: the pillar of cloud (Exodus 13:22), Joshua from the tabernacle (Exodus 33:11), the book of the Law from Joshua's mouth (Joshua 1:8), and the list goes on. This verb has no derivatives.
The verb מוש (mush II) means to feel (Genesis 27:21, Judges 16:26 and Psalm 115:7 only). It's a secondary form of the verb משש (mashash), meaning the same. This verb too has no derivatives.
The verb משש (mashash) means to feel. It's used a dozen times, with meanings ranging over a narrow spectrum, from tactile recognizance (Genesis 27:12) to groping (Deuteronomy 28:29) and searching (Genesis 31:34).