the ability not to be upset by unpleasant things.

You have to have a strong stomach to invest in the stock market these days.

• refer to someone as someone
• refer to someone as something
• refer to something
• refer to something as
• refer to something as someone
• refer to something as something
• reflect on
• reflect on someone
• reflect on something
• refresh memory
• refresh your memory
• regardless of
• regardless of something
• reign of terror
• rein in
• rein in someone
• rein in something
• reinvent the wheel
• relate to
• relate to someone
• relate to something
• relax the reins
• relieve of
• relieve of something
• relieve you of