Simple past tense and past participle of subscribe.(verb)
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Use "subscribed" in a sentence
"I've subscribed from the first issue and always thought they were doing okay."
"After I comment on a post I'd like to be automatically subscribed to the comment feed and remain subscribed for either a certain amount of time or until the commentary dies down."
"I subscribed from the get go and have never regretted not having to dispose of 1/3 cubic yard (guesstimate) of dead trees per year."