What is "to tip over"

Tip \Tip\, v. t. [Cf. LG. tippen to tap, Sw. tippa, and E. tap to strike gently.]

1. To strike slightly; to tap.

   A third rogue tips me by the elbow.
   --Swift.

2. To bestow a gift, or douceur, upon; to give a present to; as, to tip a servant. [Colloq.]
   --Thackeray.

3. To lower one end of, or to throw upon the end; to tilt; as, to tip a cask; to tip a cart.

   To tip off, to pour out, as liquor.

   To tip over, to overturn.

   To tip the wink, to direct a wink; to give a hint or suggestion by, or as by, a wink. [Slang]
   --Pope.

   To tip up, to turn partly over by raising one end.