1.VerbTo serve oneself, especially to take food or other supplies, rather than wait to be served by another; used to indicate friendly permission or invitation.
"If you want to take a shower, help yourself to towels; they're in the linen closet.; Is it all right if I get some water? —Oh, of course, help yourself!"
2.VerbTo take something freely; to serve oneself without restraint.
"He said I could help myself to the chocolates.; He didn't even ask; he just helped himself to the special tea I was saving."
3.VerbTo exhibit self-control.
"Sorry for eating all the chocolates - I couldn't help myself."
4.VerbUsed other than figuratively or idiomatically: see help.