to be slow to understand new ideas.

I tried to explain the new database, but they were remarkably slow on the uptake.

• not half
• not half bad
• no thanks to
• no thanks to someone
• no thanks to something
• not have a bean
• not have a bone in body
• tow the line
• toy boy
• to your face
• to your fingertips
• to your heart's content
• toy with
• toy with someone
• toy with something
• track down
• track down someone
• track down something
• track record
• trade down
• trade in
• trade in something
• trade on
• trade on something
• trade places