iron

1 iron /ˈajɚn/ noun
plural irons
1 iron
/ˈajɚn/
noun
plural irons
Britannica Dictionary definition of IRON
1 
[noncount] : a heavy type of metal that is very common, occurs naturally in blood, and is used to make steel and in many products
— sometimes used figuratively
— see also cast iron, wrought iron
2 
[count] : a device with a flat metal base that is heated and is used to press wrinkles out of clothing — see also curling iron, soldering iron, waffle iron
3 
[count] : a golf club that has a metal head and is identified by a number — compare wood
4 
irons [plural] : chains placed on a prisoner's arms or legs

irons in the fire

: activities or projects that someone is involved in

pump iron

— see 2pump

strike while the iron is hot

— see 1strike
2 iron /ˈajɚn/ adjective
2 iron
/ˈajɚn/
adjective
Britannica Dictionary definition of IRON
2 
always used before a noun : very strong

iron man

: a man who is very strong and is able to do something (such as play a sport) for a long time without injury or illness

rule with an iron fist/hand, rule with a rod of iron

— see 2rule
3 iron /ˈajɚn/ verb
irons; ironed; ironing
3 iron
/ˈajɚn/
verb
irons; ironed; ironing
Britannica Dictionary definition of IRON
: to use a heated iron to make clothing or fabric smooth
[+ object]
[no object]

iron out

[phrasal verb]
1 
iron (something) out or iron out (something)
: to remove (wrinkles) in cloth by using a heated iron
2 
a  : to find a solution to (something) : to fix or correct (something)
b  : to reach an agreement about (something)