To split on a rock

Split Split, v. i. 1. To part asunder; to be rent; to burst; as, vessels split by the freezing of water in them. [1913 Webster]

2. To be broken; to be dashed to pieces. [1913 Webster]

The ship splits on the rock. --Shak. [1913 Webster]

3. To separate into parties or factions. [Colloq.] [1913 Webster]

4. To burst with laughter. [Colloq.] [1913 Webster]

Each had a gravity would make you split. --Pope. [1913 Webster]

5. To divulge a secret; to betray confidence; to peach. [Slang] --Thackeray. [1913 Webster]

6. (Blackjack) To divide one hand of blackjack into two hands; -- a strategy allowed to a player when the first two cards dealt to the player have the same value. [PJC]

7. To leave; to depart (from a place or gathering); as, let's split. [Slang] [PJC]

{To split on a rock}, to fail; to to err fatally; to have the hopes and designs frustrated. [1913 Webster]