"Implicit endorsement" refers to a situation where someone's actions or words are seen as supporting or approving something without directly stating it. Full definition
I was generous when it came to what constituted implicit endorsement of either plate tectonics or biotic petroleum origins. (critical-angle.net)
So the record Black turnout plus low turnout for whites and latinos in California (because everyone knew Obama would win the state by a landlslide) plus Obama's implicit endorsement made it pass. (religion.blogs.cnn.com)
Before opening your restaurant you worked at elBulli under Ferran Adrià at the same time that René Redzepi was there, and today you three are essentially the chefs who have been most famous for elevating cuisine to the aesthetic realm of art — a feat that was given implicit endorsement when Adria was included as an artist in the last dOCUMENTA, and was also given a solo show of his preparatory sketches at the Drawing Center. (artspace.com)