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.
Lend Me Your Ear:
To politely ask for someone’s full attention.
Let Bygones Be Bygones:
To forget about a disagreement or argument.
Let Sleeping Dogs Lie:
To avoid restarting a conflict.
Let The Cat Out Of The Bag:
To share a secret that wasn’t supposed to be shared.
Level playing field:
A fair competition where no side has an advantage.
Long in the Tooth:
Old people (or horses).
Someone who is unpredictable and can cause damage if not kept in check.