IPA: /ˈaɪərnˌsaɪd/
KK: /ˈaɪərnˌsaɪd/
A person who is very strong and brave, often admired for their courage.
The soldier was known as an ironside for his fearless actions in battle.
Ironside is formed from "iron" (from Old English "iren", meaning a strong metal) and "side" (from Old English "sīde", meaning a side or a part). The term originally referred to someone who was strong or tough, as if they had sides made of iron.
Think of someone with 'sides' ('side') made of 'iron' — this helps you remember that 'ironside' refers to someone strong or tough.