I.
noun
1 line on the surface of sth where it has broken
ADJECTIVE
▪ big , deep , huge , large , long , serious ( esp. BrE )
▪ short , small
▪ fine , hairline , thin
CRACK + VERB
▪ appear
▪ develop , spread
▪ run
▪
A fine ~ ran up the wall.
2 narrow opening
ADJECTIVE
▪ narrow , small , tiny
▪ wide
VERB + CRACK
▪ fill , seal
▪
We filled the ~s in the plaster before hanging the wallpaper.
CRACK + VERB
▪ appear
▪
Wide ~s appeared in the ground during the drought.
▪ open up , widen
PREPOSITION
▪ ~ in
▪
There's a ~ in the fence big enough to look through.
PHRASES
▪ a ~ of light
▪
a tiny ~ of light under the door
▪ open a door, window, etc. a ~
▪
Could you open the window just a ~?
3 sudden loud sound
ADJECTIVE
▪ loud , resounding , sharp
▪ sickening
▪ satisfying
▪ audible
VERB + CRACK
▪ hear
CRACK + VERB
▪ echo
▪
A loud ~ echoed off the empty walls.
PREPOSITION
▪ with a ~
▪
The chandelier hit the floor with a ~.
▪ ~ of
PHRASES
▪ the ~ of a whip
▪ a ~ of thunder
II.
verb become mentally ill
ADVERB
▪ completely
▪ finally
▪
The stresses of her job became too great and she finally ~ed.
▪ up
▪
He thought he'd never get through the ordeal without ~ing up.
PHRASES
▪ ~ under the pressure , ~ under the strain , show signs of ~ing
▪
He is under a lot of pressure but is showing no signs of ~ing.
PHRASAL VERB
crack down
ADVERB
▪ hard
PREPOSITION
▪ on
▪
to ~ down hard on crime
Crack is used with these nouns as the subject: ↑ egg , ↑ glass , ↑ ice , ↑ leather , ↑ mud , ↑ thunder , ↑ veneer , ↑ voice , ↑ whip , ↑ windscreen
Crack is used with these nouns as the object: ↑ bone , ↑ case , ↑ code , ↑ crime , ↑ egg , ↑ gag , ↑ glass , ↑ grin , ↑ joke , ↑ knuckle , ↑ mirror , ↑ mystery , ↑ nut , ↑ password , ↑ puzzle , ↑ rib , ↑ safe , ↑ scheme , ↑ shot , ↑ skull , ↑ smile , ↑ whip , ↑ windscreen
III.
adj.
Crack is used with these nouns: ↑ cocaine , ↑ force , ↑ shot , ↑ team , ↑ troops