• to leave sy to his fate, to turn sy adrift
• to let sg go by the board
• to turn a vessel adrift
• to leave to sy's discretion
• to commit sg to sy's care
• to play pitch-and-toss with sg
• to leave sg in charge of sy, to place sg in sy's charge
• to refer a question to sy's judgement
• to leave nothing to chance
• to leave sg in charge of sy
• have faith in sy, to bank on sy, to be reliant on, to build upon, to place confidence in sy, to place every confidence in sy, to put faith in sy, to trust in sy
• to be reliant on, to build upon, to rely on sg, to trust to sg
• have confidence in the future
• equivocal, insecure, irresponsible, skittish, slippery, trustless, twisty, unreliable, unsteady, untrustworthy