Englishfor English speakers
double
Adjective
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A double door, window, etc. includes two of the same kind.
We opened the double door to let the piano come in.
Call me at 519-double three double seven.
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A double accident, murder, etc. is two events that happen together or are somehow connected.
With the double wedding, Sunday was the busiest day of the year.
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If something is double, it is 100% bigger than something else.
The new computer was double the cost of the old one.
I'll have a double coffee.
Usually we see about seventy people a day, but yesterday it was double.
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A double thing is for two people.
They slept together in a double bed, while James slept in a single in the other room.
double
Verb
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If something doubles, it grows by 100%.
The price of gold has almost doubled in the last month from $407 to $792.
We need to double the number of people buying it.
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If something doubles as something else, it has both roles.
The kitchen doubles as our dining room.
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If something doubles up/over, it folds in half.
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If two people double up, they stay or work together.
double
Noun
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Somebody's double is another person who looks very similar to them.
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In baseball, a double is a hit that allows the runner to move to second base.
hydraulic
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adjective
of or relating to the study of hydraulics
hydraulic engineer
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adjective
moved or operated or effected by liquid (water or oil)
hydraulic erosion
hydraulic brakes
curtain
Noun
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Curtains are pieces of cloth that hang in front of a window, door, or stage.
So I'll close the curtains and the room now will be quite dark.
We put all the lights on and draw the curtains when we're going to go out.
They got new curtains to match the carpet and the furniture.
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A curtain is a substance, or group of items that blocks your view or blocks access.
The base of the rock is undercut, permitting walkers to pass behind the curtain of falling water.
Suddenly she came out through the last curtain of trees and found herself looking down over sunlit green field.
curtain
Verb
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If you curtain something off, you put a curtain around it.