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Imagine a long, big ice cave. Two people are flying through it in a spaceship. One of them is looking around and says:

THREE METERS CLEARANCE PORT-SIDE.
ONE AND A HALF METERS STARBOARD.
WE GOT A CHOKE POINT COMING UP.

???????

Hope you'll help me.
Thanks in advance.
(That's from "The Chronicles of Riddick" movie.)
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On the left of the spaceship, the distance from the spaceship to the wall of the ice cave is three meters. On the right of the spaceship, the distance from the spaceship to the wall of the ice cave is one and a half meters. These distances are becoming less and less. The space we have to fly the spaceship through is getting smaller and smaller. There is a point ahead of us which will be very narrow. (The implication could be that the enemy may be waiting there unseen and that they may suddenly attack.)

(Another interpretation is that the narrowing of the passage is immaterial - it may remain the same - but the emphasis is on the possibility of moving into a difficult situation where there is no way out if an attack occurs.)

port = left; starboard = right. These terms apply to ships and aircraft.

"choke point" is somewhat like "bottle neck".
The check-out line in a grocery store is a sort of choke point!

Emotion: smile
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Thanks.