Intern -- verb

[bnjtokyo]

I was recently struck at the difference the use of the active vs passive voice makes to the meaning of "intern" as a verb. The dictionary gives
intern - 1 as "to work as an intern"
(e.g. After graduating from medical school, Ima Doctor interned at Bellevue.) Active voice
and
intern - 2 as "to deprive of freedom"
(e.g. The stress of his final exams was so great that Cray Z. was interned at Bellevue) Passive voice

According to Etymonline
Intern-1 is from 1933 and the English noun "intern" which, in turn, is from French "interne," assistant doctor, from Latin "internus," within, inward. Current usage covering a broad range of professional training is from 1963
while
Intern-2 is from 1886 and French "interned," send to the interior, confine from Latin "internus," within, internal

[Slava]

This explains why unpaid interns often feel they have been interned.

I had actually forgotten the "imprison" meaning at first, and took intern to mean "serve as an intern." Silly me.

The again, trial is also now a verb.