Wont go into reverse gear but will go into all other gears?

-i try to put my car into reverse and it wont go, but it goes into all other five gears. It just started this todayif it is manual(stick shift) sometimes reverse gear teeth meet each other edge to edge and will not mesh-put in 1st and move car slightly and then go to reverse-could also possibly be that the clutch is not totally releasing when being depressed-have your mechanic check the clutch(just checking not expensive)
could be ur sick or it could be the gear id take it to a shop before it get stuck into gear.
usually that's a sign that the transmission is going out and needs rebuilt.