Green horn [a person who is new at something]
Have green eyes [feel jealous]
Hold one’s tongue [keep quiet]
Keep in mind [remember]
Kill two birds with one stone [do two jobs at the same time]
Lend a hand [help]
Once in a blue moon [very seldom]
Put one’s best foot forward [do one’s best]
Rain cats and dogs [rain heavily]
Red letter day [important day]
Snake in the grass [a person who cannot be trusted]
Spread like wildfire [spread very fast]
Tell a white lie [to tell a lie for a good cause]
Take up arms [go to war]
Turn over a new leaf [change one’s behavior]
Within a stone’s throw [ very near]
