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Webster 1913 Edition
Testern
Tes′tern
,Noun.
 A sixpence; a tester. 
[Obs.] 
 Tes′tern
,Verb.
 T.
 To present with a tester. 
[Obs.] 
Shak.
 Definition 2025
testern
testern
English
Noun
testern (plural testerns)
Verb
testern (third-person singular simple present testerns, present participle testerning, simple past and past participle testerned)
-  (obsolete, transitive) To present with a tester.
-  1590 or 1591, William Shakespeare, The Two Gentlemen of Verona, Act 1 Scene 1 line 152
-  To testify to your bounty, I thank
you, you have testern'd me; in requital whereof,
henceforth carry your letters yourself. 
 -  To testify to your bounty, I thank
 
 -  1590 or 1591, William Shakespeare, The Two Gentlemen of Verona, Act 1 Scene 1 line 152