‘A gift is a bribe if you can’t eat, drink or smoke it in a day’.
‘If you think that your offer of acceptance of a particular gift would have grave or merely embarrassing consequences for your company if made public, then the gift should be considered a bribe’.
‘Bribe can be said to be a substantial amount of money or goods offered beyond a stated business contract with the aim of winning an advantage in gaining or keeping the contract ’.
Here ‘substantial’ means that which is sufficient to distort the judgment of a typical person.