Plumb/GRE/Barron

红宝 蓝宝 Barron TOEFL

plumb

• exactly vertical;
• N: weight on the end of a line; V: examine very carefully or critically in order to understand; measure depth (by sounding);
  • Ex. plumb the depth of
  • 例句: Before hanging wallpaper it is advisable to drop a plumb line from the ceiling as a guide.