be an easy/soft touch

if someone is an easy touch, it is easy to persuade them to do what you want them to do.

Her Dad's an easy touch - he's always giving her money.

• on a par with
• on a par with someone
• on a par with something
• on a roll
• on a shoestring
• on a silver platter
• on a slippery slope
• on a tangent
• on automatic pilot
• on a wing and a prayer
• on back
• on balance
• on behalf of
• on behalf of someone
• on bended knee
• on bended knees
• on best behavior
• on blocks
• on board
• on borrowed time
• on call
• on case
• once again
• once and for all
• Once bitten, twice shy.