a subject which someone would prefer not to talk about because it makes them angry or embarrassed.

I tried not to make any reference to Mike's drinking habits - I know it's a sore point with Kay at the moment. (often + with)

• all year round
• alma mater
• almost never
• a load of
• a load of crap
• a load off mind
• a load off your mind
• a load of something
• a lone voice in the wilderness
• a lone wolf
• a long face
• along for the ride
• a long haul
• a long shot
• along the line
• along the lines of
• along the lines of something
• along the same lines
• along the way
• along those lines
• along with
• along with something
• a loose cannon
• a lost cause
• a lounge lizard