at the top of (your) lungs

as loudly as you can.

She sang the national anthem at the top of her lungs.

• the kiss of death
• the knives are out
• the land of milk and honey
• the last gasp of
• the last gasp of something
• the last minute
• the last of the big spenders
• the last straw
• the last word in
• the last word in something
• the law of averages
• the law of the jungle
• the lay of the land
• the least can do
• the least you can do
• the left hand doesn't know what the right hand is doing
• the lesser of two evils
• luck into something
• luck of the draw
• luck out
• lull before the storm
• lull into
• lull into a false sense of security
• lull into doing something
• lull into something