(Britain, historical) A horse-drawn carriage for public hire. / (Britain) A black cab.

(computing) That can be hacked or broken into; insecure, vulnerable. / That lends itself to hacking (technical tinkering and modification); moddable.

The driver of a hack

Work, usually of a professional nature, either repetitive or done to a formula.

(US, informal) A taxicab driver.

plural of hackney cab

plural of hackathon

(informal) An event where programmers and others meet for collaborative software development.

plural of hackee

(US, dialect) The chickaree or red squirrel. / (US, dialect) The chipmunk.