To take something freely; to serve oneself without restraint.
Used other than figuratively or idiomatically: see help.
To serve oneself, especially to take food or other supplies, rather than wait to be served by another; used to indicate friendly permission or invitation.
To exhibit self-control.
To take (something) freely, help oneself to
To exploit (something), use freely, use to one's own advantage
To take advantage of (someone); to treat (someone) with too much familiarity, take liberties with (someone or something)