help oneself

verb[with oneself]3

1. •
   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.

   • 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. •
   To 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. •
   To exhibit self-control.

   • Sorry for eating all the chocolates - I couldn't help myself.