铁打

铁打	tiě dǎ	made of iron / strong as iron
铁	Tiě	surname Tie
铁	tiě	iron (metal) / arms / weapons / hard / strong / violent / unshakeable / determined / close / tight (slang)
打	dá	(loanword) dozen / Taiwan pr. [da3]
打	dǎ	to hit; to strike / to fight / (in many expressions) a semantically light transitive verb used with various objects to form expressions with a wide range of meanings, e.g. 打伞 "to hold an umbrella", 打电话 "to make a phone call", 打针 "to get an injection" / (coll.) from; since