ADJ

secret
Morse

VERB + CODE

break, crack, decipher
The code was difficult to crack
use, write in
invent, make up

CODE + NOUN

word

PREP

in ~
All the messages were in code

ADJ

area, dialling
What's the area code for Bath?
post/postal
bar, charge
DNA, genetic
binary (= a system of computer programming instructions)
error (= on a computer)

CODE + NOUN

number

ADJ

strict
ethical, moral
civil, criminal, disciplinary, penal
Highway
the Highway Code (= the official rules for users of public roads in Britain)
dress

VERB + CODE

have
devise, draw up, establish, formulate, lay down
The company has drawn up a new disciplinary code
comply with, follow
break, infringe, violate
He was thrown out for infringing the club's strict dress code

PHRASES

a code of behaviour/conduct/ethics/honour/practice
The profession has a strict code of practice