IN for a penny, in for a pound
1695
Canterbury Guests
v. i.
It concerns you to .. prove what you speak … In for a Penny, in for a Pound.
1815
Guy Mannering
III. vii.
Sampson .. thought to himself, in for a penny in for a pound, and he fairly drank the witch's health in a cupfull of brandy.
1841
Old Curiosity Shop
II. lxvi.
Now, gentlemen, I am not a man who does things by halves. Being in for a penny, I am ready as the saying is to be in for a pound.
1979
Member of Club
viii.
‘Do you want to go and have a look, sir?’. ‘Why not? .. In for a penny, in for a pound.’
1997
Old Gang of Mine
v. 55
‘Who told you this?’ In for a penny, in for a pound. ‘One of the potential customers mentioned it.’
action and consequence
;
perseverance
;
risk