[most] See: [AT MOST], [MAKE THE MOST OF].

[MOTD] "Message of the day"

[mother] See: [TIED TO ONE'S MOTHER'S APRON STRINGS].

[motion] See: [GO THROUGH THE MOTIONS].

[mountain] See: [MAKE A MOUNTAIN OUT OF A MOLEHILL].

[mouse] See: [PLAY CAT AND MOUSE WITH].

[Mouse Potato] The online generation's answer to the couch potato.

[mouth] See: [BORN WITH A SILVER SPOON IN ONE'S MOUTH], [BUTTER […]

[mouth-watering] {adj.} Smelling or looking very good to eat. * /It […]

[mouthful] See: [SAY A MOUTHFUL].