Definition of «thickened»

Thickened means to become thicker or more dense.

Reduce heat to medium - low; simmer until thickened slightly, 1 to 2 minutes. (marthastewart.com)
Whisk in the milk and continue to cook until slightly thickened about 5 - 6 minutes. (cookingandbeer.com)
It's not as sweet and the sauce doesn't thicken as much. (mynaturalfamily.com)
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