What part of speech is countersank?

Countersank can be categorized as a verb.

Parts of speech

• 1. countersank is a verb, past simple of countersink (infinitive).

Inflections

Verb

• Infinitive

  Present

  Simple Past

  Past Participle

  Gerund
• (to) countersink 

  countersink  / countersinks 

  countersunk  / countersank 

  countersunk 

  countersinking 

• Infinitive: (to) countersink 
• Present: countersink  / countersinks 
• Simple Past: countersunk  / countersank 
• Past Participle: (have) countersunk 
• Gerund: countersinking 

What does countersank mean?