ditch

(noun) a long narrow excavation in the earth.

(noun) any small natural waterway.

(verb) forsake. Example: "Ditch a lover."

(verb) throw away. Synonyms: chuck. Example: "Chuck these old notes."

(verb) sever all ties with, usually unceremoniously or irresponsibly. Synonyms: dump. Examples: "The company dumped him after many years of service." "She dumped her boyfriend when she fell in love with a rich man."

(verb) make an emergency landing on water.

(verb) crash or crash-land. Examples: "Ditch a car." "Ditch a plane."

(verb) cut a trench in, as for drainage. Synonyms: trench. Examples: "Ditch the land to drain it." "Trench the fields."