shin guards; shin pads; greaves; leggings
to have a guilty conscience
to depend on one's parents' (financial) support; (lit.) to nibble at one's parents' shins
to depend on somebody else's (financial) support (usu. one's parents')
sponging (e.g. off one's parents); sponger
beef shin; beef shank; gravy beef
relying on one's own resources; being entirely on one's own