counter-drill

• 一个过时动词，指朝相反方向钻孔，或进行锪孔/扩孔操作，常用于采矿或工程语境。

An obsolete verb meaning to drill in the opposite direction or to perform a counter-boring operation, typically in mining or engineering contexts.

1. Drill in an opposite directionC1formal

   To drill in a direction opposite to a previous or primary drilling operation, often used in engineering or construction to create a specific pattern or relieve stress.

   反向钻孔

   • The engineer instructed the team to counter-drill the holes to prevent cracking.
   • They had to counter-drill the metal plate to ensure even distribution of force.
   • The process requires you to counter-drill at a precise angle to the original bore.