iron fist

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Also see: fist

Concise Oxford English Dictionary © 2008 Oxford University Press:
iron/ˈʌɪən/

▶noun

• 1 a strong, hard magnetic silvery-grey metal, the chemical element of atomic number 26, used in construction and manufacturing (especially as steel). (Symbol: Fe)

• 2 a tool or implement made of iron.

  ■ (irons) fetters or handcuffs.

• 3 a hand-held implement with a heated flat steel base, used to smooth clothes and linen.

• 4 a golf club with an angled metal head used for lofting the ball.

▶verb

• 1 smooth (clothes) with an iron.

• 2 (iron something out) settle a difficulty or problem.

– phrases
have many (or other) irons in the fire have a range of options or interests.
an iron hand (or fist) in a velvet glove firmness or ruthlessness cloaked in outward gentleness.

– derivatives
ironer noun,
ironware noun.

– origin OE īren, īsen, īsern, of Gmc origin.