What is "to crack on"

Crack \Crack\ (kr[a^]k), v. t. [imp. & p. p. Cracked (kr[a^]kt); p. pr. & vb. n. Cracking.] [OE. cracken, craken, to crack, break, boast, AS. cracian, cearcian, to crack; akin to D. kraken, G. krachen; cf. Skr. garj to rattle, or perh. of imitative origin. Cf. Crake, Cracknel, Creak.]

1. To break or burst, with or without entire separation of the parts; as, to crack glass; to crack nuts.

2. To rend with grief or pain; to affect deeply with sorrow; hence, to disorder; to distract; to craze.

   O, madam, my old heart is cracked.
   --Shak.

   He thought none poets till their brains were cracked.
   --Roscommon.

3. To cause to sound suddenly and sharply; to snap; as, to crack a whip.

4. To utter smartly and sententiously; as, to crack a joke.
   --B. Jonson.

5. To cry up; to extol; -- followed by up. [Low]

   To crack a bottle, to open the bottle and drink its contents.

   To crack a crib, to commit burglary. [Slang]

   To crack on, to put on; as, to crack on more sail, or more steam. [Colloq.]