The company has relied on government support, but the government is now threatening to 'cut the apron strings'. [=to stop providing support]
He's generous, but there are always 'strings attached'. [=he always expects something in return for what he gives to people]
He really loved her but she was just 'stringing' him 'along'. [=making him think that she loved him so she could use him]
(..) BRUTAL: Paul. Dean. Yeah? Come here. Go on. BRUTAL: I guess the legislature loosened up the purse strings enough... ...to hire on a new guard. Look again. He's right... ...there. It ain't normal for a mouse (..)1999 The Green Mile