an appropriate or common activity.

When business is bad, cost-cutting is the order of the day.

Sadly, cheating seems to be the order of the day.

• could do with one arm tied behind their back
• could do with one hand tied behind back
• could do with one hand tied behind their back
• could do with something
• could hear a pin drop
• could in sleep
• could in their sleep
• couldn't [act/argue/fight] way out of a paper bag
• couldn't [act/argue/fight] your way out of a paper bag
• couldn't act way out of a paper bag
• couldn't act your way out of a paper bag
• couldn't argue way out of a paper bag
• couldn't argue your way out of a paper bag
• couldn't believe eyes
• couldn't believe your eyes
• couldn't care less
• couldn't fight way out of a paper bag
• couldn't fight your way out of a paper bag
• couldn't have asked for anything more
• couldn't have asked for more
• couldn't lie straight in bed
• couldn't organize a piss-up in a brewery
• couldn't ... way out of a paper bag
• couldn't ... your way out of a paper bag
• could standing on head