(Irregular preterit, past participle: sank, sunk).
1. To cause to sink.
2. To descend into some soft substance.
3. To fall or drop to a lower place or level; SYN. drop, drop down.
4. To go under,; SYN. settle, go down, go under.
5. To pass into a specified state or condition; SYN. pass, lapse.