protein shake
US /ˈproʊ.tiːn ˌʃeɪk/
UK /ˈproʊ.tiːn ˌʃeɪk/

1.
a drink made by mixing protein powder with water, milk, or other liquids, often consumed by athletes or people looking to increase their protein intake
:
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After his workout, he always drinks a protein shake.
•
Many bodybuilders rely on protein shakes for muscle recovery.