overspeak
/ˌəʊvəˈspiːk/Now chiefly US
verb
1 [with object] To overstate or exaggerate; to make exaggerated claims for.
2 [no object] To speak too strongly, to exaggerate; to speak too much. Also with object (refl.).
Origin
Early 17th century; earliest use found in Thomas Coryate (?1577–1617), traveller and writer. From over- + speak.