ADJ

eye (also eyewitness)
An eyewitness account described the plane as a 'fireball'
crucial, key, material, vital
As the last person to see her alive, he was a material witness in the case
independent
credible, reliable, unimpeachable
unreliable

VERB + WITNESS

appeal for
The police are appealing for witnesses
trace
Police have so far failed to trace any witnesses to the attack

WITNESS + VERB

come forward
Two witnesses came forward with evidence

WITNESS + NOUN

account, statement

PREP

~ to
a witness to murder

ADJ

chief, main, principal
the defence's chief witness
hostile
reluctant, unwilling
defence
prosecution, state
expert
character
civilian, police

VERB + WITNESS

call
The defence called their first witness
appear as
She appeared as a character witness
swear in
cross-examine, examine, interrogate, interview, question
hear
discredit
intimidate, threaten
A judicial enquiry was ordered, but witnesses were threatened and none would testify
suborn
He was charged with conspiracy to suborn witnesses

WITNESS + VERB

take the stand
The next witness took the stand
give evidence, testify
make a statement, state sth
identify sb
She was the only witness to identify Peters as the attacker

WITNESS + NOUN

box, stand
summons

PHRASES

a witness for the defence/prosecution

VERB + WITNESS

act as

WITNESS + VERB

sign

PREP

~ to
Would you be willing to act as a witness to my signature when I sign my will?