USA, 1826, as ‘to flog somebody like seven bells’—to give a severe beating to somebody—‘seven’ is perhaps simply an arbitrary intensifier—cf. phrases such as ‘like seven bells half-struck’ (‘with as much speed as possible’) and ‘to blow seven bells’ (‘to blow a violent gale’)
USA, 1924—a questionable or unorthodox practice that has long been established—from literal uses (19th century onwards) referring to former Spanish colonies in America
to make bigger or greater, to enlarge—UK, 1884, as a translation of ancient Greek ‘μεγαλύνειν’ as used in the Acts of the Apostles, 5:13—recoined in 1996 in the U.S. animated television series The Simpsons
(literally) to formally agree to something by signing an official document—(figuratively) to make a firm commitment about something—USA, 1900s, in reference to life-insurance contracts
an intelligence operative, also an intelligence operation—UK, 1966—from ‘sneaky’ (furtive, deceitful) and ‘beaky’ (referring to an overly inquisitive person, with allusion to a prominent nose)
a person who covertly exercises power by personal influence over a ruler or government without having any formal authority—ascribed to William Pitt the Elder by William Godwin in 1783
used in a situation in which someone is recognised by a person or persons whom he or she does not know or recognise—1722 in Colonel Jack, by Daniel Defoe—1656 with ‘the clown’ instead of ‘Tom Fool’