Thanks danny. SI should always go with my first idea. It just isn't something that sounds quite right to me- I'd say 'refrain' but never 'keep' in cases like yours.
But if the A at the start is wrong it must be REFRAIN for the REF +RAIN reason
I'm not disagreeing with your answer, dannyk- I'm just querying whether keep is a good synonym for refrain. Something like "hold down" may have been better I feel