viridescent/viriʹdes(ə)nt/ adj

• keep one's chin up
• keep one's countenance
• keep one's distance
• keep oneself to oneself
• keep one's end up
• keep one's eyes open/peeled/skinned
• keep one's feet
• keep one's fingers crossed
• keep one's hand in
• keep one's hands clean
• keep one's head
• keep one's head above water
• keep one's mouth shut
• keep one's nose clean
• keep one's nose out of
• keep one's nose to the grindstone
• keep one's own counsel
• keep one's pecker up
• keep one's powder dry
• keep one's shirt/hair on
• keep one's shirt on
• keep one's temper
• keep open house
• keep pace with
• keepsake