Shore Up Meaning

(idiomatic) To reinforce or strengthen (something at risk of failure).

Example:   They hastened outside between storms to shore up the damaged fence.
  He needed something bold and dramatic to shore up his failing candidacy.
2011 October 20, Jamie Lillywhite, “Tottenham 1 - 0 Rubin Kazan”[1], BBC Sport:
  Redknapp was determined to secure victory and sent on Younes Kaboul and star playmaker Luka Modric to shore things up.