Possible Clues:

• Deliberately test someone's patience (colloq.)
• Attempt to do something risky - see if something fits
• Aim to deceive sea-god, grabbing fishy tail
• Before buying a dress, you should practise a little deception
• Attempt to be provocative (colloq.)
• Test the boundaries
• See what one can get away with
• Show audacity -- hear setter put on weight
• It's what one does with jumper in shop in attempt to get away with it
• Response to "Would I look good in this?"