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So don't worry so much about how to use  had had  as a unit of grammar, they will come together naturally when you want to express the verb ' to have ' in the past perfect. Let's consider a different verb for a moment like  to want .
Search bound together and thousands of other words in English Cobuild dictionary from Reverso. You can complete the definition of bound together given by the English Cobuild dictionary with other English dictionaries : Wikipedia, Lexilogos, Oxford, Cambridge, Chambers Harrap, Wordreference, Collins Lexibase dictionaries, Merriam Webster ...