He 'dedicated' [='devoted'] his life/time 'to' helping the poor. = He 'dedicated himself to' helping the poor. [=he used his time, energy, etc., to help the poor]
We have a 'dedicated' phone line for our computer. [=a phone line that we use only for our computer]
They are a group of highly 'dedicated' [='committed', 'enthusiastic'] individuals.
(..) ''l rode the bull at Gilley's and busted my face,'' you know. A picture of an idiot in action. But now, the person who has dedicated themselves to going out and getting so drunk that they're gonna get sick, is the all-time dumb person. They stand there, just drinking, drinking. Now, the body says, (..)1983 Bill Cosby: Himself