Apollonius1
/ˌapəˈləʊnɪəs
/ (Circa 260–190 bc), Greek mathematician; known as Apollonius of Perga. He examined and redefined conic sections and was the first to use the terms ellipse, parabola, and hyperbola for these classes of curve.
Apollonius2
/ˌapəˈləʊnɪəs/ (3rd century bc), Greek poet and grammarian; known as Apollonius of Rhodes. He is known for his Argonautica, an epic poem in Homeric style dealing with the expedition of the Argonauts.
- keep one's eye on (or take one's eye off) the ball
- keep one's eyes open (or peeled or skinned)
- keep one's feet
- keep one's fingers crossed
- keep one's hands clean
- keep one's head
- keep one's head above water
- keep one's head down
- 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 powder dry
- keep one's side of the bargain
- keep one's word
- keep (or archaic bear) someone company
- keep (or eat) kosher
- keep (or hold) one's end up
- keep (or leave) one's options open
- keep (or lose) one's cool
- keep (or lose) one's temper
- keep (or lose) track of
- keep (or make) a House
- keep (or sleep in) a whole skin