To remain vigilant and ready for action.
In reference to the sport of ice hockey.
keep an eye open
To remain vigilant for someone or something.
keep one's temper
To remain calm; to avoid becoming angry or annoyed.
keep one's head
To remain calm, reasonable, level-headed, especially in a situation li…
keep a weather eye open
to maintain a background awareness of something; to remain alert to ch…
keep one's cool
To remain composed, calm, and even-tempered, especially in a provocati…
keep the ball rolling
To continue an action indicated in the context; to sustain a process.