Definition

To change a liquid, especially milk, into a solid or semi-solid state, often by the action of heat or acid.

Example

When milk is heated and mixed with lemon juice, it will curdle and form cheese.

Tense Forms

Conversation

Have you ever seen milk curdle when it goes bad?

Yeah, it's pretty gross!

I didn't know it could curdle so quickly if left out.

Right? It’s better to keep it refrigerated to avoid that.

Synonyms & Antonyms

Root Explanation

Curdle originates from the Middle English 'curdlen', which is derived from the Old English 'cyrdel', meaning to form curds. The word describes the process of milk thickening or forming into curds, typically during cheese-making.

Memory Tip

Think of milk 'forming' into 'curds' — that's what curdle means.

Visually Confused Words