noun
ADJECTIVE
▪ unwanted , unwelcome
▪ masked
VERB + INTRUDER
▪ apprehend , catch
▪ detect , disturb ( BrE ), find
▪
He found a masked ~ in the kitchen.
▪ chase away , deter , discourage , keep away , keep out
▪
Dogs can deter unwelcome ~s.
▪ tackle ( BrE )
▪
He was stabbed when he tackled an ~ armed with a knife.
▪ repel
▪
Staff were instructed to repel ~s with physical force, if need be.
INTRUDER + VERB
▪ break into , force their way into ( esp. BrE )
▪
Intruders had forced their way into the house.
INTRUDER + NOUN
▪ alarm , alert
PREPOSITION
▪ against ~s
▪
security measures against ~s