Last but not least An introduction phrase to let the audience know that the last person mentioned is no less important than those introduced before him/her. Let Bygones Be Bygones To forget about a disagreement or argument. Let The Cat Out Of The Bag To share a secret that wasn't supposed to be shared. Loose Cannon Someone who is unpredictable and can cause damage if not kept in check.
Idioms beginning with H!! These are all great!!! :) :)
He Lost His Head Angry and overcome by emotions.
Head Over Heels Very excited and/or joyful, especially when in love.
Hit The Books To study hard, especially for a test or exam. Hit The Hay Go to bed or go to sleep. Hit The Nail on the Head Do something exactly right or say something exactly right.