to do what is needed at the time.

When a crisis hits, will you rise to the occasion?

She needed some help, so I rose to the occasion and volunteered my services.

• a hue and cry
• aim below the belt
• airs and graces
• airy-fairy
• a jack of all trades
• a Jack the Lad
• a Jekyll and Hyde
• a je ne sais quoi
• a job lot
• a Job's comforter
• a Johnny-come-lately
• a judgment call
• a juggling act
• a kangaroo court
• a kept man
• a kept woman
• a kerb-crawler
• a kick in the butt
• a kick in the teeth
• a kick up the arse
• a kick up the backside
• a king's ransom
• a kissing cousin
• a knight in shining armor
• a knight in shining armour