armour
noun /ˈɑːmə(r)/
  /ˈɑːrmər/
 (US English armor)
 [uncountable]Idioms - special metal clothing that soldiers wore in the past to protect their bodies while fighting; special clothing that soldiers or police officers wear to protect their bodies
- a suit of armour
 - police officers in full body armour
 - (figurative) Monkeys do not have any kind of protective armour and use their brains to solve problems.
 
Oxford Collocations Dictionaryadjective- full
 - heavy
 - thick
 - …
 
- have on
 - wear
 - don
 - …
 
- in armour
 
- a suit of armour
 
 - metal covers that protect ships and military vehicles such as tanks                                     
 - (specialist) military vehicles used in war
- an attack by infantry and armour
 
 
Word OriginMiddle English: from Old French armure, from Latin armatura, from armare ‘to arm’, from arma ‘armour, arms’.
Idioms 
a chink in somebody’s armour 
- a weak point in somebody’s argument, character, etc., that can be used in an attackTopics Opinion and argumentc2
 
a knight in shining armour 
- (usually humorous) a man who saves somebody, especially a woman, from a dangerous situation
- She's still waiting for a knight in shining armour to come and rescue her.