What does the underlined part mean?
Whether you follow a recipe or make something up as you go along...
"make something up" means "invent something"; "as you go along" means "as you proceed". When you "make something up as you go along", it means that you don't have a fixed plan, or follow fixed instructions such as a recipe, but instead you just do (or in other contexts say) things that occur to you at the time.
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"make something up" means "invent something"; "as you go along" means "as you proceed". When you "make something up as you go along", it means that you don't have a fixed plan, or follow fixed instructions such as a recipe, but instead you just do (or in other contexts say) things that occur to you at the time.
jalehmake something up as you go along
Bonus information:
This is also so said as "wing it", by the way. (It's slang.)
I have no idea what I'm going to make for dinner tonight; I'll just wing it.
CJ