“Just what does this job 'involve'?” “It 'involves' [='entails'] traveling and a lot of overtime.”
No one knew of their romantic 'involvement'. [=no one knew that they had a romantic relationship]
The accident 'involved' three cars. = Three cars were 'involved' in the accident.
(..) 'It was Ricki Tarr.' 'Why are you telling me? ' - 'It could be coincidence...' - 'You are a poisoned dwarf. 'Why don't you fuck off to his Majesty 'and stop trying to involve me in your cabaret? ' 'Mr Esterhase: "It could be coincidence but... " 'Mr Haydon interrupting. "'You really are a poisoned dwarf, Toby. "'Why don't you fuck off to his Majesty "'and stop trying to involve me in your cabaret?"' You look tired. I didn't sleep well. You're going to do something for me, Peter. (..)2011 Tinker Tailor Soldier Spy