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[keep one's eye on the ball]  {v. phr.}

1. To watch the ball at all times in a sport, usually in order to hit it or get it; not stop watching the ball.

Keep your eye on the baseball or you won't be able to hit it.

2.  {informal}

To be watchful and  […]

[keep one's eyes open]

See: [EYES OPEN].

[keep one's eyes peeled] or [keep one's eyes skinned]  {v. phr.},  {informal}

To watch carefully; be always looking.

The bird-watcher kept his eyes peeled for bluebirds.

* /When the boys walked through the roads, they kept their eyes skinned for  […]

[keep one's feet]  {v. phr.}

To keep from falling or slipping down; keep your balance; remain standing.

The boy stumbled on the stairs but was able to keep his feet.

Compare: [REGAIN ONE'S FEET].

[keep one's feet on the ground]

See: [FEET ON THE GROUND].

[keep one's fingers crossed]

See: [CROSS ONE'S FINGERS] (1b).

[keep one's hand in]  {v. phr.}

To keep in practice; continue to take part.

After he retired from teaching, Mr. Brown kept his hand in by giving a lecture once in a while.

* /Mr. Smith left the planning of the trip to his wife, but he kept his hand  […]

[keep one's head] also [keep one's wits about one]  {v. phr.}

To stay calm when there is trouble or danger.

When Tim heard the fire alarm he kept his head and looked for the nearest exit.

Compare: [COUNT TO TEN]. Contrast: [LOSE ONE'S HEAD].

[keep one's head above water]  {v. phr.}

To remain solvent; manage to stay out of debt.

[keep one's mouth shut]  {v. phr.},  {informal}

To be or stay silent. — A rude expression when used as a command.

When the crooks were captured by the police, their leader warned them to keep their mouths shut.

* /Charles began to tell Barry how to  […]